Upstream some well intended but broken logic to reimplement the rebuild
functionality of automake. However this isn't out-of-tree safe and quite basic,
which means if it ever does execute (say, configure.ac or aclocal.m4 is touched)
then the build fails.
As we delete ${B} and re-run autoreconf on every build this is redundant, so
just delete it all.
[ YOCTO #9445 ]
Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
