It seems like nss has activated -Werror, even though the code is not
warning free: [1].  This applies also to the additional patches that
would need to be patched to be a warning free patch, endless recursion.

To avoid messing around with something like that: [2], we disable
-Werror option for now. Also note, that [2] doesn't fix all warnings,
but only part of them so that we let with unsolved non-trivially to
fix warnings on different supported compilers if we would choose the
warning-free-compilation-path.

[1] https://groups.google.com/d/topic/mozilla.dev.tech.crypto/TgnF3tIMxJ0/discussion
[2] https://git.fedorahosted.org/cgit/nss-pem.git/commit/?id=ec2b9a90623b1ec5adb6ebe8d6651b35854786ec

Change-Id: I762c03acede6c4eac715d3b0589061eeabbcc7c2
Reviewed-on: https://gerrit.libreoffice.org/22650Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: David Ostrovsky <david@ostrovsky.org>