build: Fix build on systems where /usr/bin/python isn't python 2.

configure.ac sets up a PYTHON2 variable, which is what we want
AX_PYTHON_MODULE to use (since we only use Python 2 for now).

NOTE: This is a candidate for the 9.0 branch.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=31598
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Andreas Boll <andreas.boll.dev@gmail.com>
(cherry picked from commit 121d19de920212225586c9269f2d34ab7e6e1aec)
1 file changed