define BI_RLE4/8 if not defined as well

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@26601 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/imagbmp.cpp

@@ -55,8 +55,14 @@ IMPLEMENT_DYNAMIC_CLASS(wxBMPHandler,wxImageHandler)
 #if wxUSE_STREAMS
 
 #ifndef BI_RGB
-#define BI_RGB       0
+    #define BI_RGB       0
+#endif
+
+#ifndef BI_RLE8
 #define BI_RLE8      1
+#endif
+
+#ifndef BI_RLE4
 #define BI_RLE4      2
 #endif