Use /usr/bin/env python instead of /usr/bin/python.

On operating systems like the BSDs, it is typically the case that
/usr/bin/python does not exist. We should therefore use /usr/bin/env
instead. This is also done in various other scripts in tools/.


git-svn-id: svn://svn.chromium.org/llvm-project/cfe/trunk/tools/clang-format@216945 0b72dbe1-c17f-4bc7-b9db-2b4152be0356
diff --git a/clang-format-diff.py b/clang-format-diff.py
index d6d0d44..b896ffc 100755
--- a/clang-format-diff.py
+++ b/clang-format-diff.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 #
 #===- clang-format-diff.py - ClangFormat Diff Reformatter ----*- python -*--===#
 #