libopus: updated to 1.1

Looks like a major update, with better performances for ARM.
diff --git a/jni/libopus/sources/opus_sources.mk b/jni/libopus/sources/opus_sources.mk
index 384b036..e4eeb91 100644
--- a/jni/libopus/sources/opus_sources.mk
+++ b/jni/libopus/sources/opus_sources.mk
@@ -2,4 +2,11 @@
 src/opus_decoder.c \
 src/opus_encoder.c \
 src/opus_multistream.c \
+src/opus_multistream_encoder.c \
+src/opus_multistream_decoder.c \
 src/repacketizer.c
+
+OPUS_SOURCES_FLOAT = \
+src/analysis.c \
+src/mlp.c \
+src/mlp_data.c