[test][compiler-rt] Mark fork_deadlock.cpp UNSUPPORTED
This test is broken since there's no "syscall.h". As requested in #96597, mark test as UNSUPPORTED instead of reverting.
diff --git a/compiler-rt/test/tsan/Darwin/fork_deadlock.cpp b/compiler-rt/test/tsan/Darwin/fork_deadlock.cpp
index 9525070..2a5b81c 100644
--- a/compiler-rt/test/tsan/Darwin/fork_deadlock.cpp
+++ b/compiler-rt/test/tsan/Darwin/fork_deadlock.cpp
@@ -1,3 +1,6 @@
+// TODO(#96597): fix and reenable
+// UNSUPPORTED: darwin
+
// RUN: %clangxx_tsan -O1 %s -o %t && %env_tsan_opts=atexit_sleep_ms=0 %run %t 2>&1 | FileCheck %s
// This test models what happens on Mac when fork
