multimedia/libmediainfo: Revert to previous commit

Last commit by maintainer broke users of mediainfo, revert related
libraries prior to this change
This retains changes to WWW and pkg-descr and removal of CXXFLAGS

PR:		268709, 269601
Reported by:	Michiel van Baak Jansen <michiel@vanbaak.eu>
Approved by:	portmgr (blanket, maintainer timeout: 3+ weeks)
Fixes:		93d0a119