Don't use the deprecated 'register' storage specifier.

It is not only useless with any modern C++ compiler, but also deprecated
in C++11.  Removing it fixes Clang warnings on the subject.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76580 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/osx/core/bitmap.cpp

@@ -1321,7 +1321,7 @@ wxBitmap::wxBitmap(const wxImage& image, int depth, double scale)
             UseAlpha() ;
 
         unsigned char* destinationstart = (unsigned char*) BeginRawAccess() ;
-        register unsigned char* data = image.GetData();
+        unsigned char* data = image.GetData();
         if ( destinationstart != NULL && data != NULL )
         {
             const unsigned char *alpha = hasAlpha ? image.GetAlpha() : NULL ;