package/mpd: introduce id3tag feature dependency

id3tag is a sub-feature that is needed to extract information from mp3 files.
It selects the corresponding library and handles config settings. Two other
features need this sub-feature, but handle all library selections themselves
and omit enabling the id3tag feature. In consequence, users have to remember
to select both mp3 library and id3tag, otherwise the mpd executable will not
process mp3 files.

Reflect feature dependency in mpd Config.in to make id3tag selection automatic.

Signed-off-by: Andreas Ziegler <br015@umbiko.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 876a365ea2a1c48477eabfe3ae600a9d48f1b4ab)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/mpd/Config.in

@@ -127,7 +127,7 @@ config BR2_PACKAGE_MPD_LIBSNDFILE
 config BR2_PACKAGE_MPD_MAD
 	bool "mad"
 	default y
-	select BR2_PACKAGE_LIBID3TAG
+	select BR2_PACKAGE_MPD_ID3TAG
 	select BR2_PACKAGE_LIBMAD
 	help
 	  Enable mad input support.
@@ -141,7 +141,7 @@ config BR2_PACKAGE_MPD_MODPLUG
 
 config BR2_PACKAGE_MPD_MPG123
 	bool "mpg123"
-	select BR2_PACKAGE_LIBID3TAG
+	select BR2_PACKAGE_MPD_ID3TAG
 	select BR2_PACKAGE_MPG123
 	help
 	  Enable mpg123 input support.

package/mpd/mpd.mk

@@ -190,7 +190,7 @@ MPD_CONF_OPTS += -Dsoxr=disabled
 endif
 
 ifeq ($(BR2_PACKAGE_MPD_MAD),y)
-MPD_DEPENDENCIES += libid3tag libmad
+MPD_DEPENDENCIES += libmad
 MPD_CONF_OPTS += -Dmad=enabled
 else
 MPD_CONF_OPTS += -Dmad=disabled
@@ -204,7 +204,7 @@ MPD_CONF_OPTS += -Dmodplug=disabled
 endif
 
 ifeq ($(BR2_PACKAGE_MPD_MPG123),y)
-MPD_DEPENDENCIES += libid3tag mpg123
+MPD_DEPENDENCIES += mpg123
 MPD_CONF_OPTS += -Dmpg123=enabled
 else
 MPD_CONF_OPTS += -Dmpg123=disabled