If a .bbappend file sets GALLIUMDRIVERS then virgl is always being
appended to the list of drivers to be built. Make virgl an optional
component.
(From OE-Core rev: 55256f06173de030a8f5181d72ac31d398edb398)
Signed-off-by: Fred Baksik <fred.baksik@mrcy.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>