Log Message:
Update databases/ruby-dbd-mysql to 0.4.4.

* Use lang/ruby/gem.mk instead of misc/rubygems/rubygem.mk.
* Remove default value of GEM_BUILD.

0.4.4

Make sure to use String representation of type constants. This fixes
the problem of MySQL values all becoming Ruby Strings instead of sane
and proper Ruby types (like Fixnum for MySQL integers, etc.) Thanks go
to http://github.com/naturalethic who suggested the fix at
http://github.com/Pistos/m4dbi/issues/#issue/2/comment/123677