package/mpd: create directories used in mpd.conf

Fixes:
 - https://bugs.buildroot.org/show_bug.cgi?id=13471

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

package/mpd/mpd.mk

@@ -333,6 +333,8 @@ endif
 
 define MPD_INSTALL_EXTRA_FILES
 	$(INSTALL) -m 0644 -D package/mpd/mpd.conf $(TARGET_DIR)/etc/mpd.conf
+	mkdir -p $(TARGET_DIR)/var/lib/mpd/music
+	mkdir -p $(TARGET_DIR)/var/lib/mpd/playlists
 endef
 
 MPD_POST_INSTALL_TARGET_HOOKS += MPD_INSTALL_EXTRA_FILES