configure.ac: fix the python3 interpreter detection.

Guix system users need to use guix shell and the provided
scripts/manifest.scm to do local builds and testing.

However 'guix shell --container' doesn't have /usr/bin/env, so tests
don't work if we rely on what is in the sheebang (#!).

In various Makefile.am we had:
    PY_LOG_COMPILER = $(PYTHON)
but PYTHON was undefined, so for some reasons that made 'make check'
rely on the sheebang instead of just using 'python'.

With this fix, with
'guix shell --pure --container -f scripts/manifest.scm',
./configure now properly detect the 'python3' that is in the path:
    Interpreters paths:

      PYTHON3..................: python3

And 'python3' is then used to run the python test scripts, which makes
then makes 'make check' succeed.

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

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