libfreerdp-core: enable ipv6 listener.
Merge pull request #2256 from llyzs/llyzs

libfreerdp-core: enable ipv6 listener.
cache: fixes for GlyphIndex, FastIndex & FastGlyph

* update_process_glyph_fragments() ignored the text background rectangle

* moved the OpRight value fix-up to update_process_glyph_fragments() since
  it is required for all glyph primary drawing orders
gdi: don't pollute invalid region with empty rects
Merge pull request #2257 from nfedera/fix-2014-12-05-01

cache: fixes for GlyphIndex, FastIndex & FastGlyph
Merge pull request #2258 from nfedera/fix-2014-12-05-02

gdi: don't pollute invalid region with empty rects