build: Simplify python discovery at configure time #3990
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If the desired python command is newer than the ones known by aclocal, we can use the PYTHON variable to select it:
This already worked before this change, but now we stop chasing python releases to get them automatically tested.
Refs #3982
Keeping as a draft for the moment, considering to hold it until we know the next major version (7.5.0 or 8.0.0) to make sure we don't forget to update the serial.