The code generating perl/Makefile from Makefile.PL was causing trouble
because it didn't considered NO_PERL_MAKEMAKER and ran makemaker
unconditionally, rewriting perl.mak. Makemaker is FUBAR in ActiveState Perl,
and perl/Makefile has a replacement for it.
Besides, a changed Git.pm is *NOT* a reason to rebuild all the perl scripts,
so remove the dependency too.
Signed-off-by: Alex Riesen <raa.lkml@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>