wxOS2 with Open Watcom: correct PCH usage, missing headers, warning fixes, source cleaning and other Watcom adjustements.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@34901 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/os2/filedlg.cpp

@@ -16,6 +16,8 @@
     #pragma hdrstop
 #endif
 
+#if wxUSE_FILEDLG
+
 #ifndef WX_PRECOMP
     #include "wx/utils.h"
     #include "wx/msgdlg.h"
@@ -55,6 +57,7 @@
 #ifndef MAXEXT
 # define MAXEXT                         5
 #endif
+
 IMPLEMENT_CLASS(wxFileDialog, wxFileDialogBase)
 
 // ----------------------------------------------------------------------------
@@ -207,7 +210,7 @@ int wxFileDialog::ShowModal()
     }
     if (nCount == 0)
         sDir += m_fileName;
-    if (sDir.IsEmpty())
+    if (sDir.empty())
         sDir = wxT("*.*");
     wxStrcpy((wxChar*)vFileDlg.szFullFile, sDir);
     sFilterBuffer = sDir;
@@ -253,7 +256,7 @@ int wxFileDialog::ShowModal()
                         ,&m_fileName
                         ,&sExt
                        );
-            if (zFileNameBuffer[nIdx] == wxT('.') || sExt.IsEmpty())
+            if (zFileNameBuffer[nIdx] == wxT('.') || sExt.empty())
             {
                 zFileNameBuffer[nIdx] = wxT('\0');
 
@@ -321,3 +324,4 @@ int wxFileDialog::ShowModal()
     return wxID_CANCEL;
 } // end of wxFileDialog::ShowModal
 
+#endif // wxUSE_FILEDLG