Fix 201x Visual Studio projects
Fix 201x Visual Studio projects

The previous refactor accidently changed the *_GDI+ configs to *_GDI for
excluding various image loader files and for copying config.h from
config.h.win32.  Fix this.

Spotted by Ignacio Casal Quinteiro.

GNOME/gdk-pixbuf,GNOME/gdk-pixbuf,GNOME/gdk-pixbuf,GNOME/gdk-pixbuf