Use /usr/bin/env trick to find python.  Patch by Krister Walfridsson.

llvm-svn: 75271
diff --git a/clang/utils/SummarizeErrors b/clang/utils/SummarizeErrors
index 64d7824..b6e9122 100755
--- a/clang/utils/SummarizeErrors
+++ b/clang/utils/SummarizeErrors
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 import os, sys, re