Revert "PulseAudio cannot be unloaded - fixes #2538"

This reverts commit 8b40fb0f.
Reading the PulseAudio source code, #2538 seems wrong.

Conflicts:

	bindings/python

modules/audio_output/pulse.c

@@ -107,7 +107,6 @@ vlc_module_begin ()
     add_shortcut( "pulseaudio" )
     add_shortcut( "pa" )
     set_callbacks( Open, Close )
-    linked_with_a_crap_library_which_uses_atexit()
 vlc_module_end ()
 
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