The attached patch adds NO_PERL to the build system, in the same fashion
as NO_TCLTK.

Effects:
- No perl-based scripts or code are installed:
	$SCRIPT_PERL
	git-instaweb
	gitweb
	git-cvsserver
	git-svn
- git-add does NOT have interactive support.
- None of the tests for the disabled stuff gets run.

This patch has been a optional part of the Gentoo build of Git for a
full year now, originally introduced with v1.5.4.4.

-- 
Robin Hugh Johnson
Gentoo Linux Developer & Infra Guy
E-Mail     : robbat2@gentoo.org
GnuPG FP   : 11AC BA4F 4778 E3F6 E4ED  F38E B27B 944E 3488 4E85