This argument never worked and was not passed on Windows, which is why
the Windows version needs fewer fixups (and used to work independent of
this change).
On Linux (and macOS) it was passed and prevented the server from starting and the
test would not be able to run.
See also comments on https://gitlab.kitware.com/cmake/cmake/-/merge_requests/4648
Fix Squish4RunTestCase.sh to be POSIX compliant by exiting with 255
explicitly instead of depending on bash to translate -1 to 255. This
script is used by the SQUISH_V3_ADD_TEST and SQUISH_V4_ADD_TEST macros
provided by FindSquish.
This patch adds support for Squish 4.x.
The changes are basically what is attached to
http://public.kitware.com/Bug/view.php?id=9734.
When adding a test for squish 4.x, use squish_v4_add_test().
Alex
