alpine 2.11

Merges Alpine-chappa into Alpine, following Debian & Ubuntu’s lead and adds my patch for the Yosemite build failure.

Closes #33634.
Note: Despite the way Git makes it look, I haven't actually replaced the MacPorts patch with my own. Haven't quite reached that level of self-love yet. The patch it looks like I'm replacing is actually further up in the formula here, It's the Snow Leopard one which remains.