pulseaudio: fix X11 + !locale build issue

Fixes http://autobuild.buildroot.net/results/aa1072ee5115ce12f03d600b46ff980a9d20c45d/

Pulseaudio installs autostart .desktop files when X11 support is enabled,
but the files are not created from the corresponding .desktop.in files
when built with --disable-nls (which we add for !locale builds).

Reported upstream at: https://bugs.freedesktop.org/show_bug.cgi?id=54658



Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>