package/mpv: simplify alsa-lib feature selection

Instead of having the user need to figure out that 2 alsa-lib features
are needed for mpv ALSA support, have the top-level mpv option select
the relevant alsa-lib features, when alsa-lib is enabled as already done
for pulseaudio in commit 97cd3680a4cc4bc0c71bccccb1459eda4b880159

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

package/mpv/Config.in

@@ -12,6 +12,8 @@ config BR2_PACKAGE_MPV
 	depends on BR2_PACKAGE_FFMPEG_ARCH_SUPPORTS
 	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 # C11/stdatomic.h
 	depends on BR2_TOOLCHAIN_HAS_ATOMIC
+	select BR2_PACKAGE_ALSA_LIB_MIXER if BR2_PACKAGE_ALSA_LIB
+	select BR2_PACKAGE_ALSA_LIB_PCM if BR2_PACKAGE_ALSA_LIB
 	select BR2_PACKAGE_LIBICONV if !BR2_ENABLE_LOCALE
 	select BR2_PACKAGE_FFMPEG
 	select BR2_PACKAGE_FFMPEG_SWSCALE

package/mpv/mpv.mk

@@ -39,8 +39,7 @@ else
 MPV_CONF_OPTS += --enable-libmpv-shared --disable-libmpv-static
 endif
 
-# ALSA support requires pcm+mixer
-ifeq ($(BR2_PACKAGE_ALSA_LIB_MIXER)$(BR2_PACKAGE_ALSA_LIB_PCM),yy)
+ifeq ($(BR2_PACKAGE_ALSA_LIB),y)
 MPV_CONF_OPTS += --enable-alsa
 MPV_DEPENDENCIES += alsa-lib
 else