Otherswise Clang will report the following:
```
.../include/standalone/fakeit.hpp:5337:47: runtime error: member call on address 0x7ffc27172e08 which does not point to an object of type 'rtc::test::tpsclient::ITestCaseHandler'
0x7ffc27172e08: note: object is of type 'fakeit::VirtualOffsetSelector'
 00 00 00 00  38 b1 5e 00 00 00 00 00  10 c0 91 01 00 00 00 00  10 c0 91 01 00 00 00 00  f8 1d 05 01
              ^~~~~~~~~~~~~~~~~~~~~~~
              vptr for 'fakeit::VirtualOffsetSelector'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior .../include/standalone/fakeit.hpp:5337:47 in

```

Disarm UBSAN for VirtualOffsetSelector cast

…hat have to trigger UBSAN.