gfind is now gmatch

http://lua-users.org/lists/lua-l/2013-04/msg00117.html

Btw, reverting videolan/vlc@11ffab8a5938a74646053149b104e70cdbfe42a9 does make things work, thanks for the hint [over here](https://trac.videolan.org/vlc/ticket/9495#comment:7)