package/mesa3d: dri i965 driver needs headers >= 3.17

Since
https://cgit.freedesktop.org/mesa/mesa/commit/src/intel/tools/aubinator.c?h=18.2&id=3228335b55c300cd07c4aa69329e58e70afae6a8
the dri i965 driver needs linux/memfd.h which is not available in kernel
headers older than 3.17:
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/log/include/uapi/linux/memfd.h?id=refs/tags/v3.18.36

Fixes
http://autobuild.buildroot.net/results/5aa/5aac9e9cad789da11b05cbf5d2a5e3f3cf8f1614/

[Peter: memfd.h added in 3.17]
Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/mesa3d/Config.in

@@ -187,11 +187,16 @@ config BR2_PACKAGE_MESA3D_DRI_DRIVER_I915
 config BR2_PACKAGE_MESA3D_DRI_DRIVER_I965
 	bool "DRI i965 driver"
 	depends on BR2_i386 || BR2_x86_64
+	depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_17 # memfd.h
 	select BR2_PACKAGE_MESA3D_DRI_DRIVER
 	select BR2_PACKAGE_LIBDRM_INTEL
 	help
 	  Support for i965-based Intel GPUs.
 
+comment "DRI i965 driver needs a toolchain w/ headers >= 3.17"
+	depends on BR2_i386 || BR2_x86_64
+	depends on !BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_17
+
 config BR2_PACKAGE_MESA3D_DRI_DRIVER_NOUVEAU
 	bool "DRI nouveau driver"
 	select BR2_PACKAGE_MESA3D_DRI_DRIVER