contrib: build opus by default

(cherry picked from commit 621a5ee0)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

contrib/src/opus/rules.mak

@@ -4,7 +4,7 @@ OPUS_VERSION := 1.0.1-rc3
 
 OPUS_URL := http://downloads.xiph.org/releases/opus/opus-$(OPUS_VERSION).tar.gz
 
-#PKGS += opus
+PKGS += opus
 ifeq ($(call need_pkg,"opus >= 0.9.14"),)
 PKGS_FOUND += opus
 endif