gstreamer1: fix gcc-6.2.1 build

srcpkgs/gstreamer1/template

@@ -2,7 +2,7 @@
 pkgname=gstreamer1
 reverts="1:1.4.5_1"
 version=1.8.3
-revision=2
+revision=3
 wrksrc="gstreamer-${version#*:}"
 build_style=gnu-configure
 configure_args="--disable-valgrind --enable-docbook
@@ -24,6 +24,12 @@ if [ -z "$CROSS_BUILD" ]; then
 fi
 
 pre_configure() {
+	# Remove a non-existing include path from the gstreamer.pc.in file,
+	# or otherwise building pkgs which enable -Werror fail to build with
+	# gcc-6.2.1 which issues a warning for non existing -I/some/path args.
+	# There is no ./usr/lib/gstreamer-1.0/include path in this pkg.
+	sed -i pkgconfig/gstreamer.pc.in \
+		-e 's; -I${libdir}/gstreamer-@GST_API_VERSION@/include;;'
 	NOCONFIGURE=1 ./autogen.sh
 }