Add a flag to the OpenCLZone indicating whether we are performing the
first-start OpenCL functionality verification, so that if we run into
a crash that is caught by the VCL VCLExceptionSignal_impl() handler,
we terminate the process with the EXITHELPER_NORMAL_RESTART
status after first having disabled OpenCL use. The wrapper process will
then restart soffice.bin. This is for Windows only so far.

This matches what we do if OpenGL fails early during start of
LibreOffice.

Change-Id: Ibb9bf3a86b7521bf16728de2a118ad4323be674b
Reviewed-on: https://gerrit.libreoffice.org/28086Reviewed-by: Tor Lillqvist <tml@collabora.com>
Tested-by: Tor Lillqvist <tml@collabora.com>