Remove Opus from DEPS and import a local copy

third_party/opus/src/.gitignore

Index: third_party/opus/src/.gitignore
diff --git a/third_party/opus/src/.gitignore b/third_party/opus/src/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..33127c9fe0a663b60669530b7bdb65a67d1beca5
--- /dev/null
+++ b/third_party/opus/src/.gitignore
@@ -0,0 +1,83 @@
+Doxyfile
+Makefile
+Makefile.in
+TAGS
+aclocal.m4
+autom4te.cache
+*.kdevelop.pcs
+*.kdevses
+compile
+config.guess
+config.h
+config.h.in
+config.log
+config.status
+config.sub
+configure
+depcomp
+INSTALL
+install-sh
+.deps
+.libs
+.dirstamp
+*.a
+*.exe
+*.la
+*-gnu.S
+testcelt
+libtool
+ltmain.sh
+missing
+m4/libtool.m4
+m4/ltoptions.m4
+m4/ltsugar.m4
+m4/ltversion.m4
+m4/lt~obsolete.m4
+opus_compare
+opus_demo
+repacketizer_demo
+stamp-h1
+test-driver
+*.sw*
+*.o
+*.lo
+*.pc
+*.tar.gz
+*~
+tests/*test
+tests/test_opus_api
+tests/test_opus_decode
+tests/test_opus_encode
+tests/test_opus_padding
+celt/arm/armopts.s
+celt/dump_modes/dump_modes
+celt/tests/test_unit_cwrs32
+celt/tests/test_unit_dft
+celt/tests/test_unit_entropy
+celt/tests/test_unit_laplace
+celt/tests/test_unit_mathops
+celt/tests/test_unit_mdct
+celt/tests/test_unit_rotation
+celt/tests/test_unit_types
+doc/doxygen_sqlite3.db
+doc/doxygen-build.stamp
+doc/html
+doc/latex
+doc/man
+package_version
+version.h
+celt/Debug
+celt/Release
+celt/x64
+silk/Debug
+silk/Release
+silk/x64
+silk/fixed/Debug
+silk/fixed/Release
+silk/fixed/x64
+silk/float/Debug
+silk/float/Release
+silk/float/x64
+src/Debug
+src/Release
+src/x64