update glib from 2.39.90 to 2.39.91
update glib makefile for new version and fix a comment
win: flac-1.2.1 works so use that instead of 1.3.0 on win
win: clean up some of the bundled packages, add libffi
Merge branch 'xul-9.0.1' of github.com:nightingale-media-player/nightingale-deps into xul-9.0.1
win: need to use __inline for msvc
win: fix unresolved sym _va_copy. DNE for msvc
win: add script to set up bundled packages
update fetch & build script to support multiple OSs
win: add zlib to defs.mk, part of failing attemp at building updated glib from scratch on win
win: compile flac-1.2.1 (see earlier change adding v1.2.1 in addition to 1.3.0)