Upstream build process doesn't set an explicit version of Python because script

works for Python 2.x and 3.x. But Solaris requires an explicit one, so prefer

3.4.

configure should detect Python version and allow builder to override

detection via --with-python or a PYTHON environment variable, and then the

build process should replace the first line of the script instead.

XXX file upstream bug

--- gupnp-0.20.14/tools/gupnp-binding-tool 2015-03-30 10:49:17.000000000 -0700

+++ gupnp-0.20.14/tools/gupnp-binding-tool 2015-07-05 21:13:08.428030160 -0700

@@ -1,4 +1,4 @@

-#! /usr/bin/python

+#! /usr/bin/python3.4

# Copyright (C) 2008 OpenedHand Ltd

# Copyright (C) 2008 Intel Corporation