If /tmp can't be written, bitbake gaves an unrelated error.
This checks if /tmp can be written in every build.
[YOCTO #7922]
(From OE-Core rev: 10c7cf0683494ea1bf2cc6de9b121abf2a04b253)
Signed-off-by: Mariano Lopez <mariano.lopez@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>