busybox: drop 0001-Use-CC-when-linking-instead-of-LD-and-use-CFLAGS-and.patch

This was added 10 years ago, is almost certainly non-upstreamable
and it isn't clear what the issues it aims to fix are:
the AB revealed no problems when the patch is removed.

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>