Fix/remove flawed alignment-related overflow tests.

Fix/remove three related flawed tests that attempted to cause OOM due to
large request size and alignment constraint.  Although these tests
"passed" on 64-bit systems due to the virtual memory hole, they could
pass on some 32-bit systems.

test/integration/aligned_alloc.c

@@ -47,10 +47,10 @@ TEST_BEGIN(test_oom_errors)
 
 #if LG_SIZEOF_PTR == 3
 	alignment = UINT64_C(0x4000000000000000);
-	size      = UINT64_C(0x8400000000000001);
+	size      = UINT64_C(0xc000000000000001);
 #else
 	alignment = 0x40000000LU;
-	size      = 0x84000001LU;
+	size      = 0xc0000001LU;
 #endif
 	set_errno(0);
 	p = aligned_alloc(alignment, size);