export var that is sought for afterwards from shared lib

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@26396 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/mac/carbon/app.cpp

@@ -791,7 +791,7 @@ void wxApp::CleanUp()
 
 // extern variable for shared library resource id
 // need to be able to find it with NSLookupAndBindSymbol
-short gSharedLibraryResource = kResFileNotOpened ;
+short WXDLLEXPORT gSharedLibraryResource = kResFileNotOpened ;
 
 #if defined(WXMAKINGDLL_CORE) && defined(__DARWIN__)
 CFBundleRef gSharedLibraryBundle = NULL;