Restrict moz to windows, and build vars also
impacts nss, connectivity

Change-Id: I27aae1398f3f8a4d046c2c7805d64bc7523c7282
Reviewed-on: https://gerrit.libreoffice.org/1233Reviewed-by: David Ostrovsky <David.Ostrovsky@gmx.de>
Reviewed-by: Fridrich Strba <fridrich@documentfoundation.org>
Tested-by: Fridrich Strba <fridrich@documentfoundation.org>