mlog: do not squelch console output for errors

We have functionality to squelch logging, and we use this for situations
where we run a fake interpreter and then emit output. e.g. `introspect`.

It's reasonable to avoid logging your bog-standard noisy `mlog.log()`
here, but unfortunately, we also avoided logging the output of
`mlog.exception()` followed by `sys.exit(2)`, because that went through
mlog! :P Special-case this to keep on printing, even if mlog.disable()
was used -- in such a case, we really do want to emit log output no
matter what. Users need this info to ensure they have any clue why Meson
returned a non-zero exit code.

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