PATCH_GET is no longer exported by bitbake.conf, so no longer needs
to be pruned from the gcc-cross do_compile() environment.
(From OE-Core rev: 386d1617f1e6e293506b751faa41ff8c37348973)
Signed-off-by: Andre McCurdy <armccurdy@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>