[Xcb] [Bug 96395] libxcb 1.12 does not build with python 3.4

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96395

--- Comment #1 from Josh Triplett <josh at freedesktop.org> ---
It's clear from the line in the traceback that that's a print statement, not a
print function.  For compatibility, XCB would need to use "from __future__
import print_function" and then switch to using print as a function.

I'm all for making xcbgen work with Python 3, but for the moment, until that
works, could we explicitly use Python 2 to prevent this breakage?

The scripts use "/usr/bin/env python".  "python" should not refer to Python 3,
per PEP 394 (https://www.python.org/dev/peps/pep-0394/), which says "for the
time being, all distributions should ensure that python refers to the same
target as python2"; however, some distributions (including Arch, and apparently
including macports in some configurations) go against that recommendation and
knowingly cause breakage.  To avoid that, we could use "python2" in the shebang
lines.

Similarly, in configure.ac, after calling AM_PATH_PYTHON, we should check that
$PYTHON_VERSION starts with "2.".

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