package/mesa3d: select packages required by dri3proto support dependencies

When BR2_PACKAGE_MESA3D_DRI_DRIVER and BR2_PACKAGE_XPROTO_DRI3PROTO
are selected, xlib_libxshmfence and xproto_presentproto packages
build are trigged at Makefile level.

Since 28f67899, the build
stop if a package build is trigged at Makefile level without
being selected at Config.in level.

Fixes:
http://autobuild.buildroot.net/results/6a4/6a471d2873ff7e645b0f0962d1719632e290993c



Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>