libaec: updated to 1.0.6

1.0.6

Changed
- Improved cmake for mingw by Miloš Komarčević

1.0.5

Changed
- Updated documentation to new 121.0-B-3 standard. The new standard
  mainly clarifies and explicitly defines special cases which could be
  ambiguous or misleading in previous revisions.

  These changes did *not* require any substantial changes to libaec.
  Existing compressed data is still compatible with this version of
  the library and compressed data produced by this version can be
  uncompressed with previous versions.

- Modernized CMake

- Better CMake integration with HDF5 by Jan-Willem Blokland

(adam)