Rolling up some more PRs

Closes #12546 (Add new target 'make dist-osx' to create a .pkg installer for OS X) r=brson
Closes #12575 (rustc: Move local native libs back in link-args) r=brson
Closes #12587 (Provide a more helpful error for tests that fail due to noexec) r=brson
Closes #12589 (rustc: Remove codemap and reachable from metadata encoder) r=alexcrichton
Closes #12591 (Fix syntax::ext::deriving{,::*} docs formatting.) r=huonw
Closes #12592 (Miscellaneous Vim improvements) r=alexcrichton
Closes #12596 (path: Implement windows::make_non_verbatim()) r=alexcrichton
Closes #12598 (Improve the ctags function regular expression) r=alexcrichton
Closes #12599 (Tutorial improvement (new variant of PR #12472).) r=pnkfelix
Closes #12603 (std: Export the select! macro) r=pcwalton
Closes #12605 (Fix typo in doc of Binary trait in std::fmt) r=alexcrichton
Closes #12613 (Fix bytepos_to_file_charpos) r=brson