lc_font_unregister function
Removes the font previously registered under name+weight. Returns 0
if found and removed, 1 if no font was registered under that exact
name+weight pair. Other weights registered under the same name are
unaffected.
Implementation
@ffi.Native<ffi.Int32 Function(ffi.Pointer<ffi.Char>, ffi.Int32)>()
external int lc_font_unregister(ffi.Pointer<ffi.Char> name, int weight);