added support for gcc precompiled headers

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@22723 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk1/region.cpp

@@ -12,7 +12,7 @@
 // declarations
 // ============================================================================
 
-#ifdef __GNUG__
+#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
     #pragma implementation "region.h"
 #endif
 
@@ -20,6 +20,9 @@
 // headers
 // ----------------------------------------------------------------------------
 
+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
 #include "wx/log.h"
 
 #include "wx/region.h"