Enable compression for the 256x256 icon

Bumps 200KB off the executable.
Disable RTTI for ffms2, hunspell, and universalchardet

They don't actually use it so it's just pointless bloat.
Update ffms2
Update to hunspell 1.3.3
Pass UTF-8 paths to hunspell now that it supports them
Trim a bit more out of the ICU data files
Add a custom stream IO implementation for Freetype

Freetype expects its IO to perform like mmap (i.e. seeking to be free),
but the non-unix implementation uses fseek and fread. This
implementation simply reads the entire file into a buffer, as fonts
generally aren't very big.

Cuts the time to recreate the fontconfig cache on my machine by about
60%.
Update fontconfig