Split run-unittests out as seperate target (#1255)

New `check` target now runs other.  This allows for github actions to
show unittests and system tests as separate steps.

Also a couple of CMakeLists.txt cleanups:
- Don't use add_definition to add `-fno-exceptions`, this is a C++-only
  flag.
- Lowercase the name of the `sanitizer` function.
- Remove opcode.def from list of library input file.  On windows when
  building a DLL .def files are assumed to be windows DLL .def files,
  which this is not.

This change is split out from #1250

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