configure: Bump version to 1.9.99 to indicate development cycle
configure: Bump version to 1.9.99 to indicate development cycle

1.9 is released and the master branch is now in development mode
again. Make sure the version indicates that.

bssb/emotion_generic_players,rvandegrift/emotion_generic_players,bssb/emotion_generic_players,rvandegrift/emotion_generic_players