pulseaudio: fixed some build issues

sesman/chansrv/pulse/pulse-notes.ubuntu.txt

@@ -49,6 +49,14 @@ o sudo cp module-xrdp-sink.so   /usr/lib/pulse-<version>/modules
   sudo cp module-xrdp-source.so /usr/lib/pulse-<version>/modules
   note: on a 64bit machine use lib64 instead of lib
 
+o if you build xrdp with --enable-load_pulse_modules, then the above modules
+  will get loaded automatically when xrdp starts. However if --enable-load_pulse_modules
+  is not used, then you need to edit /etc/pulse/default.pa and insert the following
+  two lines into it:
+
+  load-module module-xrdp-sink
+  load-module module-xrdp-source
+
 --------------------------------------
  To test sound/microphone redirection
 --------------------------------------

sesman/chansrv/sound.c

@@ -17,13 +17,16 @@
  */
 
 #include <stdio.h>
-#include <pulse/util.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/errno.h>
 #include <signal.h>
 #include <sys/un.h>
 
+#ifdef XRDP_LOAD_PULSE_MODULES
+#include <pulse/util.h>
+#endif
+
 #include "sound.h"
 #include "thread_calls.h"
 #include "defines.h"