glib: fix build on macOS Catalina
glib: fix build on macOS Catalina

gclosure.c:28:10: fatal error: 'ffi.h' file not found
         ^~~~~~~

* See https://github.com/ffi/ffi/pull/758
* Restore static libs recommendations.
* Fix license.

rudix-mac/rudix,rudix-mac/rudix,rudix-mac/rudix