The change in commit e903b29f (gcc-cross: pass
-Werror=poison-system-directories to compiler stages) made it impossible
to disable the error using -Wno-error=poison-system-directories.
(From OE-Core rev: 1cb0245539f7d5277fae4e9abc7f2a0130d0caa8)
Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>