This should be a const NSString* so that we can pass such variables to it

Change-Id: I017c100f83faac64ad3a8430010c226b438e6a07
Reviewed-on: https://gerrit.libreoffice.org/56529
Tested-by: Jenkins
Reviewed-by: Tor Lillqvist <tml@collabora.com>

vcl/inc/quartz/utils.h

@@ -35,7 +35,7 @@
 #include <rtl/ustring.hxx>
 
 OUString GetOUString( CFStringRef );
-OUString GetOUString( NSString* );
+OUString GetOUString( const NSString* );
 CFStringRef CreateCFString( const OUString& );
 NSString* CreateNSString( const OUString& );
 

vcl/quartz/utils.cxx

@@ -55,7 +55,7 @@ OUString GetOUString( CFStringRef rStr )
     return aRet;
 }
 
-OUString GetOUString( NSString* pStr )
+OUString GetOUString( const NSString* pStr )
 {
     if( ! pStr )
     {