build: Remove tests for getdents() and getdirentries()

These date back to 3a9beef2 in 2003 and
829e72fe in 1998 and appear to be related
to smbwrapper.

More of these should be removed but the getdirents() test caused a timeout
on an ARM builder in Debian.  It might just be a fluke but the tests are
pointless regardless.

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>

Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Tue Sep 17 13:48:18 UTC 2019 on sn-devel-184