xf86-video-intel: Fix for glibc

It fails to build wi9th glibc 2.28, add the missing required header inclusion.

(From OE-Core rev: 8f5f23a5a985f5d48973f27c143b0d5edb8ca797)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-graphics/xorg-driver/xf86-video-intel/glibc.patch

@@ -0,0 +1,25 @@
+Add a missing include needed for glibc 2.28 to avoid:
+
+| ../../git/tools/backlight_helper.c: In function 'main':
+| ../../git/tools/backlight_helper.c:54:34: error: implicit declaration of function 'major' [-Werror=implicit-function-declaration]
+|   if (fd < 0 || fstat(fd, &st) || major(st.st_dev))
+|                                   ^~~~~
+| ../../git/tools/backlight_helper.c:54:34: warning: nested extern declaration of 'major' [-Wnested-externs]
+| cc1: some warnings being treated as errors
+| Makefile:666: recipe for target 'backlight_helper.o' failed
+
+Upstream-Status: Pending
+RP 2018/8/12
+
+Index: git/tools/backlight_helper.c
+===================================================================
+--- git.orig/tools/backlight_helper.c
++++ git/tools/backlight_helper.c
+@@ -8,6 +8,7 @@
+ 
+ #include <sys/types.h>
+ #include <sys/stat.h>
++#include <sys/sysmacros.h>
+ 
+ #if MAJOR_IN_MKDEV
+ #include <sys/mkdev.h>

meta/recipes-graphics/xorg-driver/xf86-video-intel_git.bb

@@ -15,6 +15,7 @@ S = "${WORKDIR}/git"
 
 SRC_URI = "git://anongit.freedesktop.org/xorg/driver/xf86-video-intel \
            file://0001-Add-Coffeelake-PCI-IDs-for-S-Skus.patch \
+           file://glibc.patch \
            "
 
 UPSTREAM_CHECK_GITTAGREGEX = "(?P<pver>\d+(\.\d+)+)"