Rakudo Star 2013.02

Closes #18079.

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

Closes #18077.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
ruby-build 20130225

Closes #18072.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
doctor: Update Mono pkg-config warning
git: duplicate bash completion for zsh.

Should be a bit more robust than the previous method.

References #16992.
lilypond --devel 2.17.13

Closes #18080.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
BuildEnvironment: use separate sets for procs and symbols