Log Message:
Update ruby-ffi-yajl to 1.4.0.

pkgsrc change

    * Add pkg_alternatives support.
    * Fix build with newer rubygems and ruby21.

1.4.0 (02/17/2015)

New features

    * Implement :validate_utf8 (on by default) which can be set to false to
      suppress validation

Bugs fixed

    * Elan Ruusam«£e: include status code for Unknown Error
    * Tyler Vann-Campbell Fix check for windows? on cygwin and get dll name
      right
    * Correctly throw useful invalid UTF-8 error exception