Restore openssl to default brew install

We temporarily removed the brewed versions of openssl in order to satisfy
ruby-install. See postmodern/ruby-install#409 for
details. By the time we need ruby-install again hopefully the issues with
homebrew openssl will have sorted themselves out.

mac/Brewfile

@@ -42,7 +42,7 @@ brew "moreutils"
 brew "neovim"
 brew "nmap"
 brew "nnn"
-# brew "openssl" # for pyenv
+brew "openssl" # for pyenv
 # brew "pandoc"
 brew "[email protected]"
 brew "pianobar"