define _GNU_SOURCE when running tests - it's needed to see all the extensions that we test for on glibc-based systems such as Linux
define _GNU_SOURCE when running tests - it's needed to see all the
extensions that we test for on glibc-based systems such as Linux


git-svn-id: 193148810cf65385f3a195dbc9a8b504846da3a2@11241 ec53bebd-3082-4978-b11e-865c3cabbd6b

madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal