libreplaygain: bump to r475

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/multimedia/libreplaygain/libreplaygain.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBREPLAYGAIN_VERSION =  r453
+LIBREPLAYGAIN_VERSION =  r475
 LIBREPLAYGAIN_SITE = http://files.musepack.net/source
 LIBREPLAYGAIN_SOURCE = libreplaygain_$(LIBREPLAYGAIN_VERSION).tar.gz
 # upstream doesn't ship configure