rpm: Add workaround for debugedit-segv

rpm: Add workaround for debugedit-segv

[ YOCTO #4089 ]

On PPC and MIPS, there appears to be a condition that causes
debugedit to segfault.  The segfault is related to a call into
the md5hash algorithm, an address of '0', and a size > 0 is passed
causing the access of the address to segv.

This workaround may prove to be the final fix, but it's currently
unclear what the actual cause of the 0 address is.

(From OE-Core rev: a046029eb96cd9307253937ceeadafaaa6d06dce)

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>