package/mesa3d: fix xlib_libxshmfence dependency

Fixes
http://autobuild.buildroot.net/results/6b2/6b214f1013d2def0b7ff33af3115147f47afd7a1/
http://autobuild.buildroot.net/results/8b8/8b8251235f6b08ae2275659f7af241d6d43df074/
http://autobuild.buildroot.net/results/468/4681b76cbca66a267741df80719a4c2e032c6b00/
http://autobuild.buildroot.net/results/90f/90fee90a4a8f6bb35be94ee437f8f7c1f0cbb5d9/
http://autobuild.buildroot.net/results/1b8/1b862e22f9d1dfaf9b8d3a998061a83012302b05/
http://autobuild.buildroot.net/results/ebe/ebe3e12887c89649ad3de0045846836957d83396/
http://autobuild.buildroot.net/results/b7b/b7b300cc056bdc51a0570be2f250b806e306999e/
http://autobuild.buildroot.net/results/c39/c3960a95741341114ced8907de09b6a266999184/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/mesa3d/Config.in

@@ -57,7 +57,8 @@ config BR2_PACKAGE_MESA3D_GALLIUM_DRIVER
 config BR2_PACKAGE_MESA3D_DRI_DRIVER
 	bool
 	select BR2_PACKAGE_MESA3D_DRIVER
-	select BR2_PACKAGE_XLIB_LIBXSHMFENCE if BR2_TOOLCHAIN_HAS_SYNC_4
+	select BR2_PACKAGE_XLIB_LIBXSHMFENCE if \
+		(BR2_PACKAGE_XORG7 && BR2_TOOLCHAIN_HAS_SYNC_4)
 
 config BR2_PACKAGE_MESA3D_VULKAN_DRIVER
 	bool