Revert "mpg123: bump to version 1.15.4"

This reverts commit 609aa4156aa6fbda182856d3dab7df752c54eb78.

This was supposed to have been for next, not 2013.05.

package/multimedia/mpg123/mpg123.mk

@@ -4,7 +4,7 @@
 #
 #############################################################
 
-MPG123_VERSION = 1.15.4
+MPG123_VERSION = 1.15.3
 MPG123_SOURCE = mpg123-$(MPG123_VERSION).tar.bz2
 MPG123_SITE = http://downloads.sourceforge.net/project/mpg123/mpg123/$(MPG123_VERSION)
 MPG123_CONF_OPT = --with-optimization=0 --disable-lfs-alias