Log Message:
mail/ruby-mime-types: update to 3.3

Update ruby-mime-types to 3.3.

pkgsrc change: Add "USE_LANGUAGES=	# none".

## 3.3 / 2019-09-04

*   1 minor enhancement

    *   Jean Boussier reduced memory usage for Ruby versions 2.3 or higher by
        interning various string values in each type. This is done with a
        backwards-compatible call that _freezes_ the strings on older
        versions of Ruby. [#141][]

*   Administrivia:

    *   Nicholas La Roux updated Travis build configurations. [#139][]