Change perl interpreter path to the standard /usr/bin/perl.

llvm-svn: 10708
diff --git a/llvm/utils/NightlyTest.pl b/llvm/utils/NightlyTest.pl
index daac2a4..b1e907f 100755
--- a/llvm/utils/NightlyTest.pl
+++ b/llvm/utils/NightlyTest.pl
@@ -1,4 +1,4 @@
-#!/usr/dcs/software/supported/bin/perl -w
+#!/usr/bin/perl -w
 #
 # Program:  NightlyTest.pl
 #