NetBSD 10 amd64 failures

```
The following tests did not run:
        171 - FastPathAlloc (Skipped)
        172 - FastPathAlloc_optimised (Skipped)

The following tests FAILED:
         21 - BlockImpTest (SEGFAULT)
         22 - BlockImpTest_optimised (SEGFAULT)
         23 - BlockImpTest_legacy (SEGFAULT)
         24 - BlockImpTest_legacy_optimised (SEGFAULT)
```
