Undo revision 1.7: always mangle a #! line containing "python" to point

to the current Python interpreter (ie. the one used for
building/installation), even (especially!) if "/usr/bin/env" appears in
the #! line.

Rationale: installing scripts with "#!/usr/bin/env python" is asking for
trouble, because
  1) it might pick the wrong interpreter (not the one used to
     build/install the script)
  2) it doesn't work on all platforms (try it on IRIX 5, or on Linux
     with command-line options for python)
  3) "env" might not be in /usr/bin

Lib/distutils/command/build_scripts.py

@@ -10,10 +10,8 @@ import sys, os, re
 from distutils.core import Command
 from distutils.dep_util import newer
 
-# check if Python is called on the first line with this expression.
-# This expression will leave lines using /usr/bin/env alone; presumably
-# the script author knew what they were doing...)
-first_line_re = re.compile(r'^#!(?!\s*/usr/bin/env\b).*python(\s+.*)?')
+# check if Python is called on the first line with this expression
+first_line_re = re.compile(r'^#!.*python(\s+.*)?')
 
 class build_scripts (Command):