[llvm] [JITLink] [test] Extend preexisting MinGW XFAILs to new tests (PR #142375)

[Martin Storsjö via llvm-commits]

mstorsjo wrote:

> If the JIT is close to working there then we could fix this by adding a definition of `__main` to be loaded by default for MinGW triples.

Do you have any suggestion on where/how to do this?

Could we merge this first, to get the tests back to green first, and then look into providing `__main` and getting rid of these XFAILs?

https://github.com/llvm/llvm-project/pull/142375