Use __WINDOWS__ for OS checks and __WXMSW__ for GUI checks (round 2).

This is continuation of r70796 and serves the same purpose.

Closes #14065, #14066.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70808 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/dll/my_dll.cpp

@@ -22,8 +22,8 @@
     #pragma hdrstop
 #endif
 
-#ifndef __WXMSW__
-    #error "This sample is MSW-only"
+#ifndef __WINDOWS__
+    #error "This sample is Windows-only"
 #endif
 
 #include "wx/app.h"

samples/dll/wx_exe.cpp

@@ -31,8 +31,8 @@
 #include "wx/stattext.h"
 #include "wx/button.h"
 
-#ifndef __WXMSW__
-    #error "This sample is MSW-only"
+#ifndef __WINDOWS__
+    #error "This sample is Windows-only"
 #endif
 
 #ifdef WXUSINGDLL

samples/oleauto/oleauto.cpp

@@ -32,7 +32,7 @@
 
 #include "wx/msw/ole/automtn.h"
 
-#ifndef __WXMSW__
+#ifndef __WINDOWS__
 #error "Sorry, this sample works under Windows only."
 #endif
 

samples/regtest/regtest.cpp

@@ -31,7 +31,7 @@
 #include "wx/imaglist.h"
 #include "wx/tokenzr.h"
 
-#if wxUSE_CONFIG_NATIVE && defined( __WXMSW__ )
+#if wxUSE_CONFIG_NATIVE && defined( __WINDOWS__ )
 #   define DO_REGTEST 1
 #else
 #   define DO_REGTEST 0

samples/toolbar/toolbar.cpp

@@ -37,7 +37,7 @@
 
 // define this to use XPMs everywhere (by default, BMPs are used under Win)
 // BMPs use less space, but aren't compiled into the executable on other platforms
-#ifdef __WXMSW__
+#ifdef __WINDOWS__
     #define USE_XPM_BITMAPS 0
 #else
     #define USE_XPM_BITMAPS 1