mojo.syncbase: syncbase: minimal updates to mojo, for sanity
mojo.syncbase: syncbase: minimal updates to mojo, for sanity

I'm about to do something similar for Cgo (similar API and
implementation strategy), so I wanted to minimally update
mojo to have something reasonable to work against. The mojo
code certainly won't compile in its current state; various
method implementations need to be updated to reflect the API
changes. I don't plan to make further changes to the mojo
code at this time.

MultiPart: 2/2
Change-Id: I3a9c0c5d4907a9a4f7f1f2810f342439642d2634

vanadium/mojo.syncbase