gstreamer1.0-plugins-bad: fix incorrect handling of Cflags in gstreamer-gl.pc file

Cflags had GL_CFLAGS appended, which contained full sysroot path to libdrm include;
generally such dependencies should be handled by pkgconfig's Requires facility.
It's unlikely that this .pc file is used by anything, but it was causing a QA error.

(From OE-Core rev: 67fc36615351dff37516ee6c9239025198379112)

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

meta/recipes-multimedia/gstreamer/gstreamer1.0-plugins-bad/0001-gstreamer-gl.pc.in-don-t-append-GL_CFLAGS-to-CFLAGS.patch

@@ -0,0 +1,27 @@
+From a93ca63d01e7cd1e40b5be576992f77fac364bd5 Mon Sep 17 00:00:00 2001
+From: Alexander Kanavin <alex.kanavin@gmail.com>
+Date: Mon, 21 Mar 2016 18:21:17 +0200
+Subject: [PATCH] gstreamer-gl.pc.in: don't append GL_CFLAGS to CFLAGS
+
+Dependencies' include directories should not be added in this way;
+it causes problems when cross-compiling in sysroot environments.
+
+Upstream-Status: Pending
+Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
+---
+ pkgconfig/gstreamer-gl.pc.in | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/pkgconfig/gstreamer-gl.pc.in b/pkgconfig/gstreamer-gl.pc.in
+index 5589e2a..b986450 100644
+--- a/pkgconfig/gstreamer-gl.pc.in
++++ b/pkgconfig/gstreamer-gl.pc.in
+@@ -10,4 +10,4 @@ Version: @VERSION@
+ Requires: gstreamer-base-@GST_API_VERSION@ gstreamer-@GST_API_VERSION@
+ 
+ Libs: -L${libdir} -lgstgl-@GST_API_VERSION@ @GL_LIBS@
+-Cflags: -I${includedir} @GL_CFLAGS@
++Cflags: -I${includedir}
+-- 
+2.7.0
+

meta/recipes-multimedia/gstreamer/gstreamer1.0-plugins-bad_git.bb

@@ -14,6 +14,7 @@ SRC_URI = " \
     file://fix-maybe-uninitialized-warnings-when-compiling-with-Os.patch \
     file://avoid-including-sys-poll.h-directly.patch \
     file://ensure-valid-sentinels-for-gst_structure_get-etc.patch \
+    file://0001-gstreamer-gl.pc.in-don-t-append-GL_CFLAGS-to-CFLAGS.patch \
 "
 
 PV = "1.7.2+git${SRCPV}"