make NSString conversions available for all osx platforms

include/wx/osx/cocoa/private.h

@@ -518,11 +518,6 @@ extern ClassicCursor gMacCursors[];
 
 extern NSLayoutManager* gNSLayoutManager;
 
-// NSString<->wxString
-
-wxString wxStringWithNSString(NSString *nsstring);
-NSString* wxNSStringWithWxString(const wxString &wxstring);
-
 // helper class for setting the current appearance to the
 // effective appearance and restore when exiting scope
 

include/wx/osx/core/private.h

@@ -59,6 +59,11 @@ WXDLLIMPEXP_BASE long wxMacTranslateKey(unsigned char key, unsigned char code);
 
 #endif
 
+// NSString<->wxString
+
+WXDLLIMPEXP_BASE wxString wxStringWithNSString(NSString *nsstring);
+WXDLLIMPEXP_BASE NSString* wxNSStringWithWxString(const wxString &wxstring);
+
 WXDLLIMPEXP_BASE CFURLRef wxOSXCreateURLFromFileSystemPath( const wxString& path);
 
 #if wxUSE_GUI