Don't set device explicitly when capturing

Also update openal to 1.20.1 since it has pulseaudio.allow-moves by default

Fix playback devices enumerating

docs/building-cmake.md

@@ -198,7 +198,7 @@ Go to ***BuildPath*** and run
 
     git clone git://repo.or.cz/openal-soft.git
     cd openal-soft
-    git checkout openal-soft-1.19.1
+    git checkout openal-soft-1.20.1
     cd build
     if [ `uname -p` == "i686" ]; then
     cmake -D LIBTYPE:STRING=STATIC -D ALSOFT_UTILS:BOOL=OFF ..