Fixes and cleanups for converters/php-mbstring.
Fix -fstack-protector patch.
libass needs libiconv.
DATASET-875 Add support for PHP mysql native driver
MySQL 5.6 does not support readline, force editline.
Merge branch 'joyent/feature/miscfix/2013Q3' into joyent/release/2013Q3

Conflicts:
	lang/perl5/distinfo
Update 'joyent' submodule.