package/pulseaudio: alsa needs UCM

alsa needs UCM since bump to version 16.1 in commit
6f3131296484767f037d3535ab69f328e94351db to avoid the following build
failure:

In file included from ../src/modules/alsa/alsa-mixer.h:51,
                 from ../src/modules/alsa/alsa-ucm.c:51:
../src/modules/alsa/alsa-ucm.h:26:10: fatal error: alsa/use-case.h: No such file or directory
   26 | #include <alsa/use-case.h>
      |          ^~~~~~~~~~~~~~~~~

Fixes:
 - http://autobuild.buildroot.org/results/c651c03bc493ac721ad6517ace550237488ef8a8

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/pulseaudio/pulseaudio.mk

@@ -105,8 +105,8 @@ else
 PULSEAUDIO_CONF_OPTS += -Dwebrtc-aec=disabled
 endif
 
-# pulseaudio alsa backend needs pcm/mixer apis
-ifeq ($(BR2_PACKAGE_ALSA_LIB_PCM)$(BR2_PACKAGE_ALSA_LIB_MIXER),yy)
+# pulseaudio alsa backend needs pcm/mixer/ucm apis
+ifeq ($(BR2_PACKAGE_ALSA_LIB_PCM)$(BR2_PACKAGE_ALSA_LIB_MIXER)$(BR2_PACKAGE_ALSA_LIB_UCM),yyy)
 PULSEAUDIO_DEPENDENCIES += alsa-lib
 PULSEAUDIO_CONF_OPTS += -Dalsa=enabled
 else