* There were concerns that current program could fail if -Werror
  is enabled and incorrectly report stack protector availability.
* Remove "return 0;" since configure adds it automatically.
* Add -O0 to build options, otherwise the function is optimized
  away and it doesn't trigger linker failure.

Change-Id: Ib540b583019d17fec1213ff3c364030b003a5f0f
Reviewed-on: https://gerrit.libreoffice.org/60836
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>