Changelog:
===========
- Fix regression from 8.1.0 in shaping fonts with duplicate feature tags.
- Fix regression from 8.2.0 in parsing CSS-style feature strings.
- Variable fonts instanciation now handles more tables.
- Various CMake build improvements.
- various fixes to build without errors with gcc 4.9.2.
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>