Portable Python script across Python version

Get rid of Python version specific shebang.

Differential Revision: https://reviews.llvm.org/D55207

llvm-svn: 350319
diff --git a/clang/utils/check_cfc/test_check_cfc.py b/clang/utils/check_cfc/test_check_cfc.py
index e304ff5..0808252 100755
--- a/clang/utils/check_cfc/test_check_cfc.py
+++ b/clang/utils/check_cfc/test_check_cfc.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python2.7
+#!/usr/bin/env python
 
 """Test internal functions within check_cfc.py."""