audio/pulseaudio: fix build with lld 17

Building audio/pulseaudio with lld 17 results in the following link
errors:

  cc  -o src/pulse/libpulse.so.0.24.2 src/pulse/libpulse.so.0.24.2.p/channelmap.c.o src/pulse/libpulse.so.0.24.2.p/context.c.o src/pulse/libpulse.so.0.24.2.p/direction.c.o src/pulse/libpulse.so.0.24.2.p/error.c.o src/pulse/libpulse.so.0.24.2.p/ext-device-manager.c.o src/pulse/libpulse.so.0.24.2.p/ext-device-restore.c.o src/pulse/libpulse.so.0.24.2.p/ext-stream-restore.c.o src/pulse/libpulse.so.0.24.2.p/format.c.o src/pulse/libpulse.so.0.24.2.p/introspect.c.o src/pulse/libpulse.so.0.24.2.p/mainloop-api.c.o src/pulse/libpulse.so.0.24.2.p/mainloop-signal.c.o src/pulse/libpulse.so.0.24.2.p/mainloop.c.o src/pulse/libpulse.so.0.24.2.p/operation.c.o src/pulse/libpulse.so.0.24.2.p/proplist.c.o src/pulse/libpulse.so.0.24.2.p/rtclock.c.o src/pulse/libpulse.so.0.24.2.p/sample.c.o src/pulse/libpulse.so.0.24.2.p/scache.c.o src/pulse/libpulse.so.0.24.2.p/stream.c.o src/pulse/libpulse.so.0.24.2.p/subscribe.c.o src/pulse/libpulse.so.0.24.2.p/thread-mainloop.c.o src/pulse/libpulse.so.0.24.2.p/timeval.c.o src/pulse/libpulse.so.0.24.2.p/utf8.c.o src/pulse/libpulse.so.0.24.2.p/util.c.o src/pulse/libpulse.so.0.24.2.p/volume.c.o src/pulse/libpulse.so.0.24.2.p/xmalloc.c.o -L/usr/local/lib -Wl,--as-needed -Wl,--allow-shlib-undefined -Wl,-O1 -shared -fPIC -Wl,--start-group -Wl,-soname,libpulse.so.0 -fstack-protector-strong -O2 -pipe -fstack-protector-strong -isystem /usr/local/include -fno-strict-aliasing -DLIBICONV_PLUG -isystem /usr/local/include '-Wl,-rpath,$ORIGIN/..:/usr/local/lib' -Wl,-rpath-link,/wrkdirs/share/dim/ports/audio/pulseaudio/work/pulseaudio-16.1/_build/src -Wl,-rpath-link,/usr/local/lib src/libpulsecommon-16.1.so -Wl,-z,nodelete -Wl,-version-script=/wrkdirs/share/dim/ports/audio/pulseaudio/work/pulseaudio-16.1/src/pulse/map-file -lm -pthread /usr/local/lib/libdbus-1.so -ldl -lintl -Wl,--end-group
  ld: error: version script assignment of 'PULSE_0' to symbol 'pa_glib_mainloop_free' failed: symbol not defined
  ld: error: version script assignment of 'PULSE_0' to symbol 'pa_glib_mainloop_get_api' failed: symbol not defined
  ld: error: version script assignment of 'PULSE_0' to symbol 'pa_glib_mainloop_new' failed: symbol not defined
  ld: error: version script assignment of 'PULSE_0' to symbol 'pa_simple_drain' failed: symbol not defined
  ld: error: version script assignment of 'PULSE_0' to symbol 'pa_simple_flush' failed: symbol not defined
  ld: error: version script assignment of 'PULSE_0' to symbol 'pa_simple_free' failed: symbol not defined
  ld: error: version script assignment of 'PULSE_0' to symbol 'pa_simple_get_latency' failed: symbol not defined
  ld: error: version script assignment of 'PULSE_0' to symbol 'pa_simple_new' failed: symbol not defined
  ld: error: version script assignment of 'PULSE_0' to symbol 'pa_simple_read' failed: symbol not defined
  ld: error: version script assignment of 'PULSE_0' to symbol 'pa_simple_write' failed: symbol not defined
  cc: error: linker command failed with exit code 1 (use -v to see invocation)

This is because lld 17 defaults to errors when undefined symbols are
referenced in linker version scripts. Since pulseaudio uses the same
linker version script for both the regular libpulse.so, and the other
variants, libpulse-mainloop-glib.so and libpulse-simple.so, some of the
symbols are expected to be undefined, so suppress the errors by adding
-Wl,--undefined-version to LDFLAGS.

PR:		274111
Approved by:	blanket (for desktop and kde)
MFH:		2023Q4