Clean up remaining DownloadStrategy initializers
Avoid expensive Pathname concatenation
Optimize Version#<=>
Don't create MacOS.version multiple times
vim 7.3.905

Closes #19221.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
gmime-2.6.9

+ added xz to build dependencies

Signed-off-by: Aleh Suprunovich <br@ahlamon.org>
Merge branch 'master' of github.com:metabr/homebrew

* 'master' of github.com:metabr/homebrew:
  gmime-2.6.9