Update textproc/source-highlight to version 3.1.7

Upstream changes:
=================

Version 3.1.7

  * fixed compilation bugs in MacOsX systems (thanks to
    Trevor Spiteri)
  * language definition for Lilypond (thanks to Federico Bruni)
  * language definition for R statistics programming language
  * language definition for ISLISP (thanks to Christian Jullien)
  * improved Erlang definition file (thanks to Erik S淡e S淡rensen)
  * new output format: ESC 256 ascii code (thanks to
    Xavier-Emmanuel Vincent).

Version 3.1.6

  * language definition file for T/Foswiki TML markup (thanks to
    Paul W. Harvey)
  * new output format: ODF (e.g. for LibreOffice or to generate ODF
    color-highlighted snippets to be used by ODF back-ends,
    like asciidoc-odf).  Thanks to Dag Wieers.
  * new output format: MediaWiki thanks to Abe Skolnik

Version 3.1.5

  * boost m4 macro finds boost in lib64
  * boost m4 macro files are not installed
  * updated php lang definition with new php 5 keywords
  * language definition for Scheme (thanks to Orlando Hill)
  * language definition for Po files (thanks to Mikel Olasagasti)
  * language definition for Opa (thanks to Valentin Gatien-Baron)
  * language definition for Javalog (thanks to Mark Silberbauer)
  * language definition for UPC (thanks to Viraj Sinha)
  * fixed a bug in scala.lang dealing with keywords
  * updated sql.lang (thanks to Xavier-Emmanuel Vincent)
  * Emacs lisp files highlighted as Lisp (thanks to Xavier-Emmanuel Vincent)
  * improved logtalk.lang (thanks to Paulo Moura)
  * embed inputlang in the output file (thanks to Masatake Yamato)
  * highlight _ in variable declarations (thanks to Masatake Yamato)
  * correctly highlight for less when filenames contain spaces

(gls)