CppunitTest_sw_odfimport: enable all but one asserts on OS X

Change-Id: I95421d51a2750507aec5a576e161efe578fef812
Reviewed-on: https://gerrit.libreoffice.org/12020
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Miklos Vajna <vmiklos@collabora.co.uk>