libx11: fix patch headers

devtool doesn't like patches without subjects, so add meaningful subjects.

(From OE-Core rev: 3056a2e5d8b7e7285fd9680073a5ab613a4066e4)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-graphics/xorg-lib/libx11/X18NCMSstubs.patch

@@ -1,7 +1,7 @@
 From 62005ad019d6afb81da100b3113292a16472d241 Mon Sep 17 00:00:00 2001
 From: Changqing Li <changqing.li@windriver.com>
 Date: Mon, 10 Sep 2018 09:08:27 +0800
-Subject: [PATCH] 
+Subject: [PATCH] Stub out x18n
 
 Update patch to version 1.6.6
 Signed-off-by: Changqing Li <changqing.li@windriver.com>

meta/recipes-graphics/xorg-lib/libx11/fix-disable-xlocale.patch

@@ -1,7 +1,7 @@
 From 5c1693028ef12ab767d7cdbc349c27efa1ada87a Mon Sep 17 00:00:00 2001
 From: Changqing Li <changqing.li@windriver.com>
 Date: Mon, 10 Sep 2018 09:13:38 +0800
-Subject: [PATCH]
+Subject: [PATCH] Fix build when xlocale disabled
 
 Signed-off-by: Xiaofeng Yan <xiaofeng.yan@windriver.com>
 

meta/recipes-graphics/xorg-lib/libx11/fix-utf8-wrong-define.patch

@@ -1,7 +1,7 @@
 From 046703373055c7029c19d171e415ff3caaa87372 Mon Sep 17 00:00:00 2001
 From: Changqing Li <changqing.li@windriver.com>
 Date: Mon, 10 Sep 2018 09:16:33 +0800
-Subject: [PATCH]
+Subject: [PATCH] Disable unicode
 
 Signed-off-by: Xiaofeng Yan <xiaofeng.yan@windriver.com>