Freetype: fix compilation with 2.5.1

Close #10019
audio unit: fix init order
Qt: update QUrlValidator (fix #9932)

somehow #3435
demux: playlist: asx: handle common mime type for asx playlist and asf

http://gonze.com/playlists/playlist-format-survey.html#ASX
contrib: added target for glib since this is a required dependency to compile fluidsynth (refs #10014)
contrib: added target for libffi since it is required to compile glib, which in turn is needed for Fluidsynth on Darwin (refs #10014)
contrib/fluidsynth: add glib dependency
codec/fluidsynth: fixed linking on Darwin
Merge remote-tracking branch: upstream/master