[test][llvm-objcopy/mac] Fix invalid strip tests

I discovered some of these tests had `cmp` statements that weren't
actually being run. I had also recently copied this broken setup for a
new test around chained fixups. Fixing this revealed that the binaries
did differ because of their code signature so I regenerated the fixture
here with this source:

```c
int main() {
   return 0;
}
```

Passing `-Wl,-no_adhoc_codesign` on my M1 machine to make sure it didn't
get any signature.

Differential Revision: https://reviews.llvm.org/D119203