renamed ATTRIBUTE_PRINTF to WX_ATTRIBUTE_PRINTF to avoid naming conflicts (e.g. with latest libxml2)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@59479 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

tests/strings/vsnprintf.cpp

@@ -90,7 +90,7 @@ int r;
         wxString(buffer))
 
 // this is the same as wxSnprintf() but it passes the format string to
-// wxVsnprintf() without using ATTRIBUTE_PRINTF and thus suppresses the gcc
+// wxVsnprintf() without using WX_ATTRIBUTE_PRINTF and thus suppresses the gcc
 // checks (and resulting warnings) for the format string
 //
 // use with extreme care and only when you're really sure the warnings must be