[gtk+] Fix distcheck

[Matthias Clasen <matthiasc src gnome org>]

commit a2f0c860ee8be497829df4c14a87ea0225db8d4d
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Dec 21 14:12:17 2016 -0500

    Fix distcheck

 gsk/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gsk/Makefile.am b/gsk/Makefile.am
index 8a7a5a3..1f2730b 100644
--- a/gsk/Makefile.am
+++ b/gsk/Makefile.am
@@ -23,7 +23,7 @@ DISTCLEANFILES =
 noinst_LTLIBRARIES =
 
 if HAVE_VULKAN
-gsk_private_vulan_source_h = \
+gsk_private_vulkan_source_h = \
        gskvulkanblendpipelineprivate.h \
        gskvulkanbufferprivate.h \
        gskvulkancolorpipelineprivate.h \