mpg123: build with alsa only

Signed-off-by: Ted Hess <thess@kitschensync.net>

sound/mpg123/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=mpg123
 PKG_VERSION:=1.22.3
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=http://www.mpg123.de/download/
@@ -51,6 +51,7 @@ define Build/Configure
 		--enable-shared \
 		--enable-static \
 		--with-cpu=generic_nofpu \
+		--with-audio=alsa \
 		--with-default-audio=alsa \
 	)
 endef