Allow predefining wxUSE_UNICODE_WINDOWS_H in wxMSW builds

This can be used in order to use normal Unicode build of wxWidgets with
an application that needs to use ANSI versions of Win32 functions, e.g.
because it doesn't compile with UNICODE defined.

include/wx/msw/winundef.h

@@ -15,6 +15,14 @@
 #define _WX_WINUNDEF_H_
  */
 
+#ifndef wxUSE_UNICODE_WINDOWS_H
+    #ifdef _UNICODE
+        #define wxUSE_UNICODE_WINDOWS_H 1
+    #else
+        #define wxUSE_UNICODE_WINDOWS_H 0
+    #endif
+#endif
+
 // ----------------------------------------------------------------------------
 // windows.h #defines the following identifiers which are also used in wxWin so
 // we replace these symbols with the corresponding inline functions and
@@ -34,7 +42,7 @@
                              HWND hwndParent,
                              DLGPROC pDlgProc)
     {
-        #ifdef _UNICODE
+        #if wxUSE_UNICODE_WINDOWS_H
             return CreateDialogW(hInstance, pTemplate, hwndParent, pDlgProc);
         #else
             return CreateDialogA(hInstance, pTemplate, hwndParent, pDlgProc);
@@ -62,7 +70,7 @@
                             DWORD family,
                             LPCTSTR facename)
     {
-        #ifdef _UNICODE
+        #if wxUSE_UNICODE_WINDOWS_H
             return CreateFontW(height, width, escapement, orientation,
                                weight, italic, underline, strikeout, charset,
                                outprecision, clipprecision, quality,
@@ -90,7 +98,7 @@
                              HINSTANCE hInstance,
                              LPVOID lpParam)
     {
-        #ifdef _UNICODE
+        #if wxUSE_UNICODE_WINDOWS_H
             return CreateWindowW(lpClassName, lpWndClass, dwStyle, x, y, w, h,
                                  hWndParent, hMenu, hInstance, lpParam);
         #else
@@ -107,7 +115,7 @@
 
     inline HMENU LoadMenu(HINSTANCE instance, LPCTSTR name)
     {
-        #ifdef _UNICODE
+        #if wxUSE_UNICODE_WINDOWS_H
             return LoadMenuW(instance, name);
         #else
             return LoadMenuA(instance, name);
@@ -122,7 +130,7 @@
 
     inline HWND APIENTRY FindText(LPFINDREPLACE lpfindreplace)
     {
-        #ifdef _UNICODE
+        #if wxUSE_UNICODE_WINDOWS_H
             return FindTextW(lpfindreplace);
         #else
             return FindTextA(lpfindreplace);
@@ -136,7 +144,7 @@
    #undef GetCharWidth
    inline BOOL  GetCharWidth(HDC dc, UINT first, UINT last, LPINT buffer)
    {
-   #ifdef _UNICODE
+   #if wxUSE_UNICODE_WINDOWS_H
       return GetCharWidthW(dc, first, last, buffer);
    #else
       return GetCharWidthA(dc, first, last, buffer);
@@ -148,7 +156,7 @@
 
 #ifdef FindWindow
    #undef FindWindow
-   #ifdef _UNICODE
+   #if wxUSE_UNICODE_WINDOWS_H
    inline HWND FindWindow(LPCWSTR classname, LPCWSTR windowname)
    {
       return FindWindowW(classname, windowname);
@@ -165,7 +173,7 @@
 
 #ifdef PlaySound
    #undef PlaySound
-   #ifdef _UNICODE
+   #if wxUSE_UNICODE_WINDOWS_H
    inline BOOL PlaySound(LPCWSTR pszSound, HMODULE hMod, DWORD fdwSound)
    {
       return PlaySoundW(pszSound, hMod, fdwSound);
@@ -182,7 +190,7 @@
 
 #ifdef GetClassName
    #undef GetClassName
-   #ifdef _UNICODE
+   #if wxUSE_UNICODE_WINDOWS_H
    inline int GetClassName(HWND h, LPWSTR classname, int maxcount)
    {
       return GetClassNameW(h, classname, maxcount);
@@ -199,7 +207,7 @@
 
 #ifdef GetClassInfo
    #undef GetClassInfo
-   #ifdef _UNICODE
+   #if wxUSE_UNICODE_WINDOWS_H
    inline BOOL GetClassInfo(HINSTANCE h, LPCWSTR name, LPWNDCLASSW winclass)
    {
       return GetClassInfoW(h, name, winclass);
@@ -216,7 +224,7 @@
 
 #ifdef LoadAccelerators
    #undef LoadAccelerators
-   #ifdef _UNICODE
+   #if wxUSE_UNICODE_WINDOWS_H
    inline HACCEL LoadAccelerators(HINSTANCE h, LPCWSTR name)
    {
       return LoadAcceleratorsW(h, name);
@@ -233,7 +241,7 @@
 
 #ifdef DrawText
    #undef DrawText
-   #ifdef _UNICODE
+   #if wxUSE_UNICODE_WINDOWS_H
    inline int DrawText(HDC h, LPCWSTR str, int count, LPRECT rect, UINT format)
    {
       return DrawTextW(h, str, count, rect, format);
@@ -252,7 +260,7 @@
 #ifdef StartDoc
    #undef StartDoc
 
-   #ifdef _UNICODE
+   #if wxUSE_UNICODE_WINDOWS_H
    inline int StartDoc(HDC h, CONST DOCINFOW* info)
    {
       return StartDocW(h, (DOCINFOW*) info);
@@ -271,7 +279,7 @@
    #undef GetObject
    inline int GetObject(HGDIOBJ h, int i, LPVOID buffer)
    {
-   #ifdef _UNICODE
+   #if wxUSE_UNICODE_WINDOWS_H
       return GetObjectW(h, i, buffer);
    #else
       return GetObjectA(h, i, buffer);
@@ -285,7 +293,7 @@
    #undef GetMessage
    inline int GetMessage(LPMSG lpMsg, HWND hWnd, UINT wMsgFilterMin, UINT wMsgFilterMax)
    {
-   #ifdef _UNICODE
+   #if wxUSE_UNICODE_WINDOWS_H
       return GetMessageW(lpMsg, hWnd, wMsgFilterMin, wMsgFilterMax);
    #else
       return GetMessageA(lpMsg, hWnd, wMsgFilterMin, wMsgFilterMax);
@@ -298,7 +306,7 @@
     #undef LoadIcon
     inline HICON LoadIcon(HINSTANCE hInstance, LPCTSTR lpIconName)
     {
-        #ifdef _UNICODE
+        #if wxUSE_UNICODE_WINDOWS_H
             return LoadIconW(hInstance, lpIconName);
         #else // ANSI
             return LoadIconA(hInstance, lpIconName);
@@ -311,7 +319,7 @@
     #undef LoadBitmap
     inline HBITMAP LoadBitmap(HINSTANCE hInstance, LPCTSTR lpBitmapName)
     {
-        #ifdef _UNICODE
+        #if wxUSE_UNICODE_WINDOWS_H
             return LoadBitmapW(hInstance, lpBitmapName);
         #else // ANSI
             return LoadBitmapA(hInstance, lpBitmapName);
@@ -323,7 +331,7 @@
 
 #ifdef LoadLibrary
     #undef LoadLibrary
-    #ifdef _UNICODE
+    #if wxUSE_UNICODE_WINDOWS_H
     inline HINSTANCE LoadLibrary(LPCWSTR lpLibFileName)
     {
         return LoadLibraryW(lpLibFileName);
@@ -339,7 +347,7 @@
 // FindResource
 #ifdef FindResource
     #undef FindResource
-    #ifdef _UNICODE
+    #if wxUSE_UNICODE_WINDOWS_H
     inline HRSRC FindResource(HMODULE hModule, LPCWSTR lpName, LPCWSTR lpType)
     {
         return FindResourceW(hModule, lpName, lpType);