configure: remove unused --enable-glx
configure: remove unused --enable-glx

(cherry picked from commit 6344d9bbc22395d4a51a5d44fcddea0c1fe45e3b)

jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2