Contribs: update to the Opus release 1.0.1

(cherry picked from commit 0f4a8e79a31a319feb400f1bdab6cb6169d6d52f)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

contrib/src/opus/SHA512SUMS

-5024cd81c62d67be1e190a50fe915bcc724ea30dc586caa4d2cc1ba33ac1702e21df40707d55ebf36beb2cfec15d20027ce04297d9ea8cde662064242544cbb8  opus-1.0.1-rc3.tar.gz
+6b8096c38e6a4c3baf34b4687b41f088fef21ebcbe7008f161c49db7bbc65374f304a69c0cf123578e84b9cacbc96dcc33b19992e7ac2c2d29757cc212259f6f  opus-1.0.1.tar.gz

contrib/src/opus/rules.mak

 # opus
 
-OPUS_VERSION := 1.0.1-rc3
+OPUS_VERSION := 1.0.1
 
 OPUS_URL := http://downloads.xiph.org/releases/opus/opus-$(OPUS_VERSION).tar.gz