Add a PACKAGECONFIG for gnu-efi, by default the meson.build looks explicitly in
/usr/include and /usr/lib for gnu-efi, and if it is present on the host the
build will fail.
[ YOCTO #13487 ]
Original patch by Chin Huat Ang.
(From OE-Core rev: 050cda9f02c6a5c773edf092514b173839569a48)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>