w32: Add link to $(NETLIB) for -lws2_32.
* dirmngr/Makefile.am (dirmngr_LDADD): Add $(NETLIBS). * sm/Makefile.am (gpgsm_LDADD): Ditto. * tools/Makefile.am (gpg_wks_client_LDADD): Ditto.
- GnuPG-bug-id: T4994
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>