[Ohrrpgce] SVN: teeemcee/12712 scons: fallback to python or py if python3 isn't present, or print an er

[subversion at HamsterRepublic.com]

teeemcee
2022-01-25 05:09:31 -0800 (Tue, 25 Jan 2022)
446
scons: fallback to python or py if python3 isn't present, or print an error message

The Windows Python installer doesn't seem to include a python3.exe, and by
default doesn't even put python.exe in the PATH either, although there's a
checkbox for that. However I think it does put py.exe in the path, which is a
helper for launching different python versions.

Also, Windows 10 includes dummy python and python3 executables, so filter those out.
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U   wip/SConscript