m4/ctng_python.m4: Fix library check

There is subtle difference between our CTNG_PYTHON and the AX_PYTHON on
which it is based. The latter uses AC_CHECK_PROGS() which sets
PYTHON_BIN to the name of the executable. We use AC_PATH_PROGS() which
sets PYTHON_BIN to the full path of the executable.

Because the name of the executable is the same as the library AX_PYTHON
uses this when looking for the library with AC_CHECK_LIB() which magics
itself into a linker flag like `-lpython3.11` but our version ends up
with a nonsensical `-l/usr/bin/python3.11` so the check fails and we
keep iterating repeating the same wrong check for every tested python
version.

We can't just switch to using AC_CHECK_PROGS() because we do want to use
the variable set by AC_PATH_PROGS() to set the full path in paths.sh.
Ultimately we could probably switch to using the upstream AX_PYTHON
macro (https://www.gnu.org/software/autoconf-archive/ax_python.html) and
figure out a better way of getting the full path of the exectuable but
for now add an extra AC_CHECK_PROGS() to set a different variable and
use that for AC_CHECK_LIB().

Signed-off-by: Chris Packham <judge.packham@gmail.com>

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