perl/Makefile if MakeMaker is not installed (NO_PERL_MAKEMAKER)

I just wanted to report that Git.pm is installed to $(prefix)/lib if 
NO_PERL_MAKEMAKER is set, which doesn't seem right.

$ make NO_PERL_MAKEMAKER=yes prefix=$HOME/tmp/git-install install
[...]
$ find ~/tmp/git-install -name \*.pm
/home/lea/tmp/git-install/lib/Git.pm
/home/lea/tmp/git-install/lib/Error.pm

Without NO_PERL_MAKEMAKER, it works fine:

$ make clean
$ rm ~/tmp/git-install -r
$ make prefix=$HOME/tmp/git-install install
[...]
$ find ~/tmp/git-install -name \*.pm
/home/lea/tmp/git-install/share/perl/5.10.0/Git.pm

-- Lea