module/gui/macosx/intf.m: Use a const char * in parameters where desired.

modules/gui/macosx/intf.h

@@ -310,7 +310,7 @@ struct intf_sys_t
 - (id)getVoutMenu;
 - (id)getEyeTVController;
 - (void)applicationWillTerminate:(NSNotification *)notification;
-- (NSString *)localizedString:(char *)psz;
+- (NSString *)localizedString:(const char *)psz;
 - (char *)delocalizeString:(NSString *)psz;
 - (NSString *)wrapString: (NSString *)o_in_string toWidth: (int)i_width;
 - (BOOL)hasDefinedShortcutKey:(NSEvent *)o_event;

modules/gui/macosx/intf.m

@@ -751,7 +751,7 @@ static VLCMain *_o_sharedMainInstance = nil;
     return( TRUE );
 }
 
-- (NSString *)localizedString:(char *)psz
+- (NSString *)localizedString:(const char *)psz
 {
     NSString * o_str = nil;