Disable dtrace option as it's not actually implemented properly
(even though advertised by configure). Do not break 3rd party modules that
may have DTrace implemented perfectly well.
Make sure unwanted mkdir is not recorded with full path in rbconfig.rb,
fixes packages built with pbulk.
Merge branch 'joyent/feature/miscfix/2013Q1' into joyent/release/2013Q1
Update joyent