Support for Channel Mapping 253

OpusProjection* classes
MixingMatrix class
Projection tests

Change-Id: I98644466abf4ffd36e48bdecad1204d69e1539b9
Signed-off-by: Jean-Marc Valin <jmvalin@jmvalin.ca>
diff --git a/opus_sources.mk b/opus_sources.mk
index e4eeb91..b0763f9 100644
--- a/opus_sources.mk
+++ b/opus_sources.mk
@@ -4,7 +4,10 @@
 src/opus_multistream.c \
 src/opus_multistream_encoder.c \
 src/opus_multistream_decoder.c \
-src/repacketizer.c
+src/repacketizer.c \
+src/opus_projection_encoder.c \
+src/opus_projection_decoder.c \
+src/mapping_matrix.c
 
 OPUS_SOURCES_FLOAT = \
 src/analysis.c \