Delete Firestore's Unity glue code, which now lives with the Unity C# code (#352)

Author: dconeybe

build_scripts/other/package.sh

@@ -32,9 +32,6 @@ for incdir in */src/include; do
 done
 cd "${origpath}"
 
-# Remove unneeded Unity include files.
-rm -rf "${destpath}/include/firebase/csharp/"
-
 # Copy release files into packaged SDK.
 cp -af "${sourcepath}"/release_build_files/* "${destpath}"