Add thunks for MojoGetRights(), etc.

mojo/edk/embedder/entrypoints.cc

Index: mojo/edk/embedder/entrypoints.cc
diff --git a/mojo/edk/embedder/entrypoints.cc b/mojo/edk/embedder/entrypoints.cc
index 44c1e2293cb15a2408d07e242f2e3d964daab8a2..b500f6bb0733d2a4fe48193cde061cdef3bb0755 100644
--- a/mojo/edk/embedder/entrypoints.cc
+++ b/mojo/edk/embedder/entrypoints.cc
@@ -27,6 +27,10 @@ MojoResult MojoClose(MojoHandle handle) {
   return g_core->Close(handle);
 }
 
+MojoResult MojoGetRights(MojoHandle handle, MojoHandleRights* rights) {
+  return g_core->GetRights(handle, MakeUserPointer(rights));
+}
+
 MojoResult MojoWait(MojoHandle handle,
                     MojoHandleSignals signals,
                     MojoDeadline deadline,