Update and change license information of Droplet sounds, now it's CC BY 3.0
Was previously labelled under license CC Sampling+ 1.0, which is
considered non-free by FSF, OSI and DFSG.
foreach(dir
British
Classic
Default
Default_es
Default_pl
Default_ru
Default_uk
HillBilly
Mobster
Pirate
Robot
Russian
Russian_pl
Singer
Surfer
)
add_subdirectory(${dir})
endforeach(dir)