Use /usr/bin/env to find python

Python may not be /usr/bin/python on some systems. For example, on
FreeBSD it will be /usr/local/bin/python.

Reviewers: samsonov
Differential Revision: http://reviews.llvm.org/D9914

llvm-svn: 238428

compiler-rt/lib/sanitizer_common/scripts/cpplint.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 #
 # Copyright (c) 2009 Google Inc. All rights reserved.
 #

compiler-rt/lib/sanitizer_common/scripts/litlint.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 #
 # litlint
 #