Merge branch 'remove-outdated-gcc-checks'

Remove vestiges of support for gcc < 4 and related checks.

See https://github.com/wxWidgets/wxWidgets/pull/2096

include/wx/gtk/bitmap.h

@@ -72,11 +72,6 @@ public:
         { Create(sz, depth); }
     wxBitmap( const char bits[], int width, int height, int depth = 1 );
     wxBitmap( const char* const* bits );
-#ifdef wxNEEDS_CHARPP
-    // needed for old GCC
-    wxBitmap(char** data)
-        { *this = wxBitmap(const_cast<const char* const*>(data)); }
-#endif
     wxBitmap( const wxString &filename, wxBitmapType type = wxBITMAP_DEFAULT_TYPE );
 #if wxUSE_IMAGE
     wxBitmap(const wxImage& image, int depth = wxBITMAP_SCREEN_DEPTH, double scale = 1.0);