remove standalone test "issue_9812"

This test has a few problems:

 * I don't want to vendor third party projects into the main compiler
   repository such as kuba-zip just for test cases. If we want to test
   third party projects, that should be a separate repository dedicated
   to that purpose.

 * Ideally tests would be isolated to test a particular thing, rather
   than have a lot of unrelated logic that is not what is primarily
   being tested.

 * Ideally tests will not be named after GitHub issues, but named after
   the thing that is being tested. And not testing for the absence of a
   bug, but for the existence of correct behavior.

Aside from these issues, it's also failing in the LLVM 16 branch:

```
kuba-zip/zip.c:276:16: error: call to undeclared function 'fileno'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
kuba-zip/zip.c:277:14: error: call to undeclared function 'ftruncate'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
kuba-zip/zip.c:364:11: error: call to undeclared function 'symlink'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
```

These are not interesting failures related to the thing actually being
tested; this is busywork related to the fact that we vendor third party
code. So, that is why I chose to delete this test case instead of repair
it.

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