Overview of changes between 1.11.3 and 1.11.4
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* Major change in the low-level interface of Pango.  The special value
  PANGO_GLYPH_EMPTY is now defined to mean a "draw nothing" glyph.  This
  was what glyph 0 was used for previously.  As a result, bumped up the
  Pango module version, meaning that modules compiled against earlier
  versions are probably not compatible with this release. [#73147]
* New framework in examples for building a binary called pango-view,
  that can be used to render a text file using any of the available
  backends.  This is installed into bindir now.
* Enhancements to the FT2 backend, to draw boxes on missing glyphs.
* Better hexbox drawing for cairo backend:  Hinting hexbox, and
  drawing a single-row hexbox for very small font sizes.
* Improved documentation.