Flags for c9.rb to find libffi stuff.
No ctim structure on osx, only st_ctime.
Update osx conditionals for ffi.
Be (in an ugly way) explicit about ptrtype_t.
Fixes to testext to make it compile on osx.
Change .so to .dylib on osx.
Merge branch 'rbconfig-ruby' into osx-build
Define the correct struct stat for osx on osx.
Merge branch 'osx-build'