Log Message:
www/ruby-sassc: update to 2.3.0

Update to ruby-sassc to 2.3.0.

- **2.3.0**
  - [Fix rake gem:native task](https://github.com/sass/sassc-ruby/pull/196)
  - [disable lto flag for darwin + nix](https://github.com/sass/sassc-ruby/pull/166)
  - [Sort input file list](https://github.com/sass/sassc-ruby/pull/178)
  - [Set appropriate encoding for \ 
source_map](https://github.com/sass/sassc-ruby/pull/152)
  - [allow passing functions directly](https://github.com/sass/sassc-ruby/pull/162)
  - [always dispose data context](https://github.com/sass/sassc-ruby/pull/161)
  - [Update libsass to 3.6.3](https://github.com/sass/sassc-ruby/pull/164)
  - [Restore strip symbols](https://github.com/sass/sassc-ruby/pull/184)
  - [Default --march-tune-native to \ 
false](https://github.com/sass/sassc-ruby/pull/158)
  - [Fix compile issue on Mac OS X](https://github.com/sass/sassc-ruby/pull/174)
  - [Test on TruffleRuby in TravisCI](https://github.com/sass/sassc-ruby/pull/171)
  - [Use RbConfig::MAKEFILE_CONFIG['DLEXT'] instead of hardcoding \ 
extensions](https://github.com/sass/sassc-ruby/pull/173)