Bug 1530715 - P1: Create an empty cubeb-coreaudio-rs crate in libcubeb. r=kinetik

To import cubeb-coreaudio-rs crate later, creating a dummy folder in
advance in libcubeb. It should be the mirrow of cubeb-coreaudio-rs crate
on github. The information of cubeb-coreaudio-rs is in README_MOZILLA.

Differential Revision: https://phabricator.services.mozilla.com/D23429

--HG--
extra : moz-landing-system : lando

media/libcubeb/cubeb-coreaudio-rs/README_MOZILLA

@@ -0,0 +1,6 @@
+The source from this directory was copied from the cubeb-coreaudio-rs
+git repository using the update.sh script.
+
+The cubeb-coreaudio-rs git repository is: https://github.com/ChunMinChang/cubeb-coreaudio-rs
+
+The git commit ID used was 0000000000000000000000000000000000000000 (0000-00-00 00:00:00)

media/libcubeb/cubeb-coreaudio-rs/update.sh

@@ -0,0 +1,35 @@
+# Usage: sh update.sh <upstream_src_directory>
+set -e
+
+cp -p $1/LICENSE .
+cp -p $1/Cargo.toml .
+cp -r $1/coreaudio-sys-utils .
+test -d src || mkdir -p src
+# Copy all the files under src folder, except tests.
+rsync -av --progress $1/src/ src/ --exclude backend/tests
+
+if [ -d $1/.git ]; then
+  rev=$(cd $1 && git rev-parse --verify HEAD)
+  date=$(cd $1 && git show -s --format=%ci HEAD)
+  dirty=$(cd $1 && git diff-index --name-only HEAD)
+fi
+
+if [ -n "$rev" ]; then
+  version=$rev
+  if [ -n "$dirty" ]; then
+    version=$version-dirty
+    echo "WARNING: updating from a dirty git repository."
+  fi
+  echo "$version ($date)"
+  sed -i.bak -e "/The git commit ID used was/ s/[0-9a-f]\{40\}\(-dirty\)\{0,1\} .\{1,100\}/$version ($date)/" README_MOZILLA
+  rm README_MOZILLA.bak
+else
+  echo "Remember to update README_MOZILLA with the version details."
+fi
+
+# Apply patches for gecko
+for patch in *.patch; do
+  [ -f "$patch" ] || continue
+  echo "Apply $patch"
+  patch -p4 < $patch
+done