Separate Xcode and CLT doctor checks by OS X version

Closes #29206.
wavpack 4.70.0
youtube-dl 2014.05.05

Closes #29194.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
youtube-dl: update 2014.05.05 bottle.
Add head for libebml
Add head for libmatroska

Closes #29174.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>