clean/test-c/test-python run python on the build host, but $(PYTHON) was
chosen from $(IS_WIN), which is derived from the target triple
($(CC) -dumpmachine). A Linux->mingw cross build (make CC=x86_64-w64-mingw32-gcc
...) therefore sets IS_WIN and picks `python`, which fails on hosts where only
`python3` exists (e.g. Debian/Ubuntu) — breaking the cross-compile path #171
added.
Key PYTHON off the host instead: $(OS)=Windows_NT (the #129 signal) is set in
every Windows shell and empty on Linux/macOS. EXE stays driven by the target
triple, as it should. Addresses @rofl0r's host/target note on #171.
Co-authored-by: bopof <285767350+bopof@users.noreply.github.com>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
bopof
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