Make check files with python bindings.

[Thomas Klausner]

On Sat, May 17, 2014 at 10:19:52AM -0700, John Ralls wrote:
> While we're on the subject of runTests.py, we've got a configure substitution for the shebang. Is there some platform (MinGW maybe?) where `#!/usr/bin/env python` doesn't work?

There are platforms where "python" doesn't exist, only "python2.6",
"python2.7", etc. Configure could test that for that.

Even worse, there are platforms where /usr/bin/env doesn't exist; for
example because it's in /bin/env (Haiku, IIRC).
 Thomas