[clang] [clang][test] Fix solaris ld driver test to not assume gnu ld location (PR #186250)

[Carlo Cabrera via cfe-commits]

https://github.com/carlocab approved this pull request.

I don't know anything about Solaris, but I did read https://reviews.llvm.org/D84029 and agree that this patch better captures the intent from there.

https://github.com/llvm/llvm-project/pull/186250