Reapply "package/ffmpeg: add support for pulseaudio"

This reverts commit fecc337d21f337a30ef7f9f448683d99c01fc245,
re-adding optional support for pulseuadio in ffmpeg.

This is possible now that the circular dependency:

  pulseaudio -> libsoxr -> ffmpeg -> pulseaudio

has been broken between libsoxr and ffmpeg.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/ffmpeg/ffmpeg.mk

@@ -92,6 +92,13 @@ else
 FFMPEG_CONF_OPTS += --disable-libjack
 endif
 
+ifeq ($(BR2_PACKAGE_PULSEAUDIO),y)
+FFMPEG_DEPENDENCIES += pulseaudio
+FFMPEG_CONF_OPTS += --enable-libpulse
+else
+FFMPEG_CONF_OPTS += --disable-libpulse
+endif
+
 ifeq ($(BR2_PACKAGE_LIBV4L),y)
 FFMPEG_DEPENDENCIES += libv4l
 FFMPEG_CONF_OPTS += --enable-libv4l2