configure: make pulseaudio and alsa configurable options

Allows disabling pulseaudio and alsa support at configure time
making builds more deterministic.

Change-Id: I4f1719cf831458b1d5ad3ebc01f6782b897d392c
Reviewed-by: Martin Jansa <Martin.Jansa@gmail.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Kalle Viironen <kalle.viironen@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

configure

@@ -1805,6 +1805,20 @@ while [ "$#" -gt 0 ]; do
             UNKNOWN_OPT=yes
         fi
         ;;
+    pulseaudio)
+        if [ "$VAL" = "yes" ] || [ "$VAL" = "no" ]; then
+            CFG_PULSEAUDIO="$VAL"
+        else
+            UNKNOWN_OPT=yes
+        fi
+        ;;
+    alsa)
+        if [ "$VAL" = "yes" ] || [ "$VAL" = "no" ]; then
+            CFG_ALSA="$VAL"
+        else
+            UNKNOWN_OPT=yes
+        fi
+        ;;
     gtkstyle)
         if [ "$VAL" = "yes" ] || [ "$VAL" = "no" ]; then
             CFG_QGTKSTYLE="$VAL"
@@ -2369,6 +2383,12 @@ Third Party Libraries:
     -no-glib ........... Do not compile Glib support.
  +  -glib .............. Compile Glib support.
 
+    -no-pulseaudio ..... Do not compile PulseAudio support.
+ +  -pulseaudio ........ Compile PulseAudio support.
+
+    -no-alsa ........... Do not compile ALSA support.
+ +  -alsa .............. Compile ALSA support.
+
 Additional options:
 
     -make <part> ....... Add part to the list of parts to be built at make time.