[sanitizer] [Darwin] Disable InstallAtForkHandler

This is a followup to d01be3c.

Author: Azharuddin Mohammed

compiler-rt/lib/asan/asan_posix.cpp

@@ -149,7 +149,7 @@ void PlatformTSDDtor(void *tsd) {
 #endif
 
 void InstallAtForkHandler() {
-#  if SANITIZER_SOLARIS || SANITIZER_NETBSD
+#  if SANITIZER_SOLARIS || SANITIZER_NETBSD || SANITIZER_APPLE
   return;  // FIXME: Implement FutexWait.
 #  endif
   auto before = []() {

compiler-rt/lib/lsan/lsan_posix.cpp

@@ -101,7 +101,7 @@ void InstallAtExitCheckLeaks() {
 }
 
 void InstallAtForkHandler() {
-#  if SANITIZER_SOLARIS || SANITIZER_NETBSD
+#  if SANITIZER_SOLARIS || SANITIZER_NETBSD || SANITIZER_APPLE
   return;  // FIXME: Implement FutexWait.
 #  endif
   auto before = []() {

compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.c

@@ -15,6 +15,7 @@
 // FIXME: Requires `FutexWait` implementation. See __asan::InstallAtForkHandler.
 // UNSUPPORTED: target={{.*solaris.*}}
 // UNSUPPORTED: target={{.*netbsd.*}}
+// UNSUPPORTED: target={{.*apple.*}}
 
 // Forking in multithread environment is unsupported. However we already have
 // some workarounds, and will add more, so this is the test.