configure: simplify summary.
configure: simplify summary.

Signed-off-by: Gwenole Beauchesne <729713629d9640cc095f1c77c692e1881f8093c4@intel.com>

zzhhui/libva,01org/iotg-lin-gfx-libva,gbeauchesne/libva,halleyzhao/libva-fdo,01org/libva-cros,android-ia/hardware_intel_libva,01org/iotg-lin-gfx-libva,gbeauchesne/libva,pma1/libva,CyanogenMod/android_hardware_intel_libva,CyanogenMod/android_hardware_intel_libva,pma1/libva,Distrotech/libva,gbeauchesne/libva,01org/libva-cros,01org/libva-cros,zzhhui/libva,android-ia/hardware_intel_libva,01org/iotg-lin-gfx-libva,android-ia/hardware_intel_libva,halleyzhao/libva-fdo,Distrotech/libva,pma1/libva,zzhhui/libva,CyanogenMod/android_hardware_intel_libva,chenxianqin/vaapi-libva,chenxianqin/vaapi-libva,chenxianqin/vaapi-libva,Distrotech/libva,halleyzhao/libva-fdo