wxmac: patch to fix 10.10 build.

We seem to have started accepting Yosemite patches, so here’s the
popular upstream proposed one that fixes 10.10 compile errors. It’s not
as thorough as a few other patches lying around, but it does the job
and is easiest to scope to just Yosemite for now without dragging
anything else in.
wxmac: add mirror.

For some reason SourceForge is having a bad day and consequently the
bot is mass failing a ton of stuff being tested. This is a mirror to
placate it. (*Hopefully*).
wxmac: update 3.0.1 bottle.

Closes #32078.
Closes #31522.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>