Base profile: unmask *working* versions of Mesa and libs

profiles/base/package.accept_keywords

@@ -6,6 +6,7 @@
 =dev-libs/libgcrypt-1.7.1 **
 =dev-libs/libgpg-error-1.22 **
 =dev-util/cflow-1.4 **
+=media-libs/mesa-11.2.2 **
 =media-libs/phonon-4.9.0 **
 =sys-apps/less-483-r1 **
 =sys-apps/net-tools-1.60_p20160215155418 **
@@ -15,6 +16,8 @@
 =sys-kernel/linux-headers-4.4 **
 =sys-process/fcron-3.2.0-r1 **
 =sys-process/procps-3.3.11-r3 **
+=x11-libs/libdrm-2.4.68 **
+=x11-libs/libva-vdpau-driver-0.7.4-r4 **
 
 =dev-lang/python-3.4.3-r7 **
 =app-eselect/eselect-python-20160222 **