Now that oe-core only has one copy of m4, there's no need to maintain two inc
files.
(From OE-Core rev: a67391afd7fe8b7dc40e49c66cfd6250a077361c)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>