waf: use Python from environment

OXINARF · tridge · commit d9ad3eeab07e · 2018-11-13T10:30:34.000+11:00
diff --git a/waf b/waf
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 from __future__ import print_function
 import subprocess

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-#!/usr/bin/python`
	`1`	`+#!/usr/bin/env python`
`2`	`2`
`3`	`3`	`from __future__ import print_function`
`4`	`4`	`import subprocess`