Windows NT compatibility fixes.

Rev: src/post_modules/GTK/source/gdkdrawable.pre:1.9
Rev: src/post_modules/GTK/source/gdkgc.pre:1.9
Rev: src/post_modules/GTK/source/gdkpixmap.pre:1.9
Rev: src/post_modules/GTK/source/gdkwindow.pre:1.13
Rev: src/post_modules/GTK/source/global.pre:1.16
Rev: src/post_modules/GTK/source/gtkclist.pre:1.8
Rev: src/post_modules/GTK/source/gtkpaned.pre:1.4
Rev: src/post_modules/GTK/source/gtksocket.pre:1.7
Rev: src/post_modules/GTK/source/gtkwidget.pre:1.11