[compiler-rt] [compiler-rt] Fix #122795 for solaris platforms proposal. (PR #122956)

[Florian Mayer via llvm-commits]

fmayer wrote:

Does this mean that solaris is `SI_POSIX` but doesn't use sanitizer_platform_limits_posix? Sadness :(


https://github.com/llvm/llvm-project/pull/122956