[libc++][z/OS] Fix shared_ptr control block test when aligned allocation is not available (llvm#109693)

This PR fixes the shared_ptr control block layout test that was recently updated in llvm#76756.
When aligned allocation/deallocation is not available, part of the test doesn't work.

Author: zibi2

libcxx/test/libcxx/utilities/memory/util.smartptr/util.smartptr.shared/libcxx.control_block_layout.pass.cpp

@@ -195,10 +195,12 @@ int main(int, char**) {
   test<TrivialEmptyType, FinalEmptyAlloc>();
   test<TrivialEmptyType, NonTrivialAlloc>();
 
+#if !defined(TEST_HAS_NO_ALIGNED_ALLOCATION)
   test<OveralignedEmptyType, TrivialEmptyAlloc>();
   test<OveralignedEmptyType, TrivialNonEmptyAlloc>();
   test<OveralignedEmptyType, FinalEmptyAlloc>();
   test<OveralignedEmptyType, NonTrivialAlloc>();
+#endif
 
   test<TrivialNonEmptyType, TrivialEmptyAlloc>();
   test<TrivialNonEmptyType, TrivialNonEmptyAlloc>();