build/meson: use python3 interpreter for "generate-setting-docs.py"
Fedora 32 drops "python" from the path. Hence "/usr/bin/env python" won't work anymore. Of course, who needs a way to invoke the interpreter that works accross different distributions! WTF. In this case, easy to work around. We run it from meson, so we have access to the Python 3 binary. Just call python explicitly, like we do with autotools.
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