Add wxHAS_SVG feature test macro

This is more clear and future-proof than using wxHAS_RAW_BITMAP for
checking for SVG availability.

src/generic/bmpsvg.cpp

@@ -19,13 +19,14 @@
 // for compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
-#ifdef wxHAS_RAW_BITMAP
+#include "wx/bmpbndl.h"
+
+#ifdef wxHAS_SVG
 
 #ifndef WX_PRECOMP
     #include "wx/utils.h"                   // Only for wxMin()
 #endif // WX_PRECOMP
 
-#include "wx/bmpbndl.h"
 #include "wx/rawbmp.h"
 
 #include "wx/private/bmpbndl.h"
@@ -180,4 +181,4 @@ wxBitmapBundle wxBitmapBundle::FromSVG(const char* data, const wxSize sizeDef)
     return FromSVG(copy.data(), sizeDef);
 }
 
-#endif // wxHAS_RAW_BITMAP
+#endif // wxHAS_SVG