Yesterday's changes to the runtime linker:
* Update the PEi386 stuff to compile in the new framework.
  Note!  Certainly will _not_ work properly as-is.
* A conceptual cleanup for all platforms: only record, in the
  oc.symbols field, the names of symbols which have been put into the
  global symbol table, rather than (name, addr) pairs -- the addr
  is redundant.