Similar to 4e4847dd71 which disabled writes to fs and gs register in "cleared segment registers" test: https://bugs.winehq.org/show_bug.cgi?id=51152
Followup to 03fe2b36cd.
The [test pattern page](https://test.winehq.org/data/patterns.html#ntdll:exception) shows several 64-bit linux machines suffering from this.
-- v2: ntdll/tests: Check if writing to fs and gs causes child processes to crash.