Use python2 instead of python in #! lines in pypy/bin/*.

In 8e9f4fa, I did a similar change for /pytest.py and nobody complained, so I hope this will not break anyone’s workflow. :)

Author: manueljacob

pypy/bin/checkmodule.py

@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python2
 """
 Usage:  checkmodule.py <module-name>
 

pypy/bin/dotviewer.py

@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python2
 """
 Command-line interface for a dot file viewer.
 Run with no arguments for help.

pypy/bin/pyinteractive.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 
 """Main entry point into the PyPy interpreter.  For a list of options, type
 

pypy/bin/reportstaticdata.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 
 """
 Usage: reportstaticdata.py [-m1|-m2|-t] [OPTION]... FILENAME