[third_party] port latest changes from QtAwesome

namely
- https://github.com/gamecreature/QtAwesome/commit/0599b36d65dcfaaa3b6fe8f4d07ef2264177805c
- https://github.com/gamecreature/QtAwesome/commit/026244f0b970f833cbe907b19a6abb87acf03d70

no functional changes