Add a few options to fix csmith test host incompatibilities
Add a few options to fix csmith test host incompatibilities

- Disable packed structs, since Nyuzi doesn't support unaligned accesses
- Disable 64-bit types, per issue #68. Since my 64-bit host has a different
  size for (long int), this could result in different conversions.

[ci skip]

jbush001/NyuziProcessor,jbush001/NyuziProcessor,jbush001/NyuziProcessor,jbush001/NyuziProcessor,jbush001/NyuziProcessor,jbush001/NyuziProcessor