darwin: be less annoying about "incompatible" library versions

After #3316 we set a default minimum version, now this will warn if you
link with a library that is targeting later versions.

This might be a bit annoying, especially when the user hasn't actually
given Odin a minimum target.

So this PR makes these warnings only show when you explicitly give a
target version (afaik that is the only thing that -mmacosx-min-version
actually does for us because we don't use it to compile anything, just
to link).

0 files changed, 0 insertions, 0 deletions