Move DSS_HIDEPREFIX fallback definition to the central header.

Do it only once now that it's used in 3 different places (it recently started
to be used in src/msw/anybutton.cpp as well) instead of defining it thrice.

This also fixes MinGW build.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75930 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/missing.h

@@ -48,6 +48,10 @@
     #define DT_HIDEPREFIX 0x00100000
 #endif
 
+#ifndef DSS_HIDEPREFIX
+    #define DSS_HIDEPREFIX  0x0200
+#endif
+
 // Needed by toplevel.cpp
 #ifndef UIS_SET
     #define UIS_SET         1

src/msw/anybutton.cpp

@@ -103,10 +103,6 @@ using namespace wxMSWImpl;
     #define ODS_NOFOCUSRECT     0x0200
 #endif
 
-#ifndef DT_HIDEPREFIX
-    #define DT_HIDEPREFIX       0x00100000
-#endif
-
 #if wxUSE_UXTHEME
 extern wxWindowMSW *wxWindowBeingErased; // From src/msw/window.cpp
 #endif // wxUSE_UXTHEME

src/msw/menuitem.cpp

@@ -149,10 +149,6 @@ private:
 #define SPI_GETKEYBOARDCUES 0x100A
 #endif
 
-#ifndef DSS_HIDEPREFIX
-#define DSS_HIDEPREFIX  0x0200
-#endif
-
 #if wxUSE_UXTHEME
 
 enum MENUPARTS

src/msw/ownerdrw.cpp

@@ -23,10 +23,6 @@
 #include "wx/msw/private/dc.h"
 #include "wx/msw/wrapcctl.h"            // for HIMAGELIST
 
-#ifndef DSS_HIDEPREFIX
-#define DSS_HIDEPREFIX  0x0200
-#endif
-
 // ----------------------------------------------------------------------------
 // constants for base class
 // ----------------------------------------------------------------------------