Since re-using code from git.git proper is the quick way
forward, we need to list those who have given their consent
to do just that. The relicense permission is only valid for
use with libgit2, and only for GPLv2 + gcc-exception (as
specified by 'COPYING'.

Signed-off-by: Andreas Ericsson <ae@op5.se>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>