[CMake] Don't add -Wnon-virtual-dtor if affected by GCC PR102168

See the discussion on
https://reviews.llvm.org/rG4852c770fe8703145dd2a35395985646ce57a454
The GCC behavior (https://gcc.gnu.org/PR102168) seems unhelpful.

Unconditional -Wnon-virtual-dtor led to other unnecessary workarounds like
6df09d6c

This patches uses a variant of the 4bb5f44c
check to detect GCC PR102168.

Reviewed By: dblaikie

Differential Revision: https://reviews.llvm.org/D109404