[gtk+] Drop gdkmain.h

[Matthias Clasen <matthiasc src gnome org>]

commit 38c83109692a6f45fc17b3ab05f8c7b413812121
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Nov 17 00:13:21 2017 -0500

    Drop gdkmain.h

 gdk/gdkmain.h   |   36 ------------------------------------
 gdk/meson.build |    1 -
 2 files changed, 0 insertions(+), 37 deletions(-)
---
diff --git a/gdk/meson.build b/gdk/meson.build
index 3fe6b99..5acc582 100644
--- a/gdk/meson.build
+++ b/gdk/meson.build
@@ -58,7 +58,6 @@ gdk_public_headers = files([
   'gdkglcontext.h',
   'gdkkeys.h',
   'gdkkeysyms.h',
-  'gdkmain.h',
   'gdkmonitor.h',
   'gdkpango.h',
   'gdkpixbuf.h',