[compiler-rt] [asan,test] Disable _FORTIFY_SOURCE test incompatible with glibc 2.40 (PR #101566)

[Sam James via llvm-commits]

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

LGTM but give azanella a chance to comment (or be prepared to followup on comment afterwards). Thanks for digging into it. We should really run the compiler-rt testsuite before glibc releases given how often this sort of thing happens.

https://github.com/llvm/llvm-project/pull/101566