Only build/run hsearch_basic and hsearch_r_basic on NetBSD

hdestroy1 is not present on FreeBSD

Sponsored by: EMC / Isilon Storage Division


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272890 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f