[BUG] git-am and git-submodule rely on $PATH to find perl

Both scripts run perl without any path, i.e. they don't use the $PERL_PATH that was passed at build time.

On Thu, Jul 21, 2011 at 12:35:56AM +0200, Peter Simons wrote:

This isn't exactly a bug. The rule we usually follow in git is that you can use "perl" in the PATH when you are doing simple awk-like things that any version of perl should do. But you must use PERL_PATH for #!-lines (because we can't do PATH lookup there), or for any non-trivial script.

That being said, I don't see any downside to using PERL_PATH. The Makefile tweaks would be pretty minimal. Want to work up a patch?

-Peff