I know the environment setup script would set PKG_CONFIG_PATH,
but the meson won't take that env when translate the includedir
property from the pkg-config.
(From OE-Core rev: 4ac692422526a2924602df410d7562b31d36c0ae)
Signed-off-by: Randy Li <ayaka@soulik.info>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>