[sanitizer] Disable malloc_hook_skip on Darwin

Followup to D123566

compiler-rt/test/sanitizer_common/TestCases/malloc_hook_skip.cpp

@@ -3,6 +3,7 @@
 // Test requires platform with thread local support with no dependency on malloc.
 // UNSUPPORTED: android
 // UNSUPPORTED: ios
+// UNSUPPORTED: darwin
 
 #include <assert.h>
 #include <sanitizer/allocator_interface.h>