Export PERL_PATH

PERL_PATH is used by perl/Makefile so export it.

Signed-off-by: Luben Tuikov <ltuikov@yahoo.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/Makefile b/Makefile
index 676d426..05cfe45 100644
--- a/Makefile
+++ b/Makefile
@@ -228,6 +228,8 @@
 	PERL_PATH = /usr/bin/perl
 endif
 
+export PERL_PATH
+
 LIB_FILE=libgit.a
 XDIFF_LIB=xdiff/lib.a