Building the host tool 'mkbuiltins' will fail if the target CFLAGS
contains an option which isn't supported by the host's gcc. To prevent
the issue, define LDFLAGS_FOR_BUILD based on CFLAGS_FOR_BUILD instead
of CFLAGS.
(From OE-Core rev: 7a8ec63f38f7a387e01343fbb971b75a66e0f851)
Signed-off-by: Andre McCurdy <armccurdy@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>