[build] Change python path to /usr/bin/env python

Signed-off-by: Julien Danjou <julien@danjou.info>

build-utils/extractoptsdoc.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 #
 # extractoptsdoc.py - extract options documentation from awesome sour code
 # Copyright (C) 2008 Julien Danjou <julien@danjou.info>

build-utils/extractuicbdoc.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 #
 # extractuicbdoc.py - extract uicb documentation from awesome sour code
 # Copyright (C) 2008 Julien Danjou <julien@danjou.info>