Log Message:
nss: update to 3.81.

Changes:
 - Bug 1762831: Enable aarch64 hardware crypto support on OpenBSD.
 - Bug 1775359 - make NSS_SecureMemcmp 0/1 valued.
 - Bug 1779285: Add no_application_protocol alert handler and test client error \ 
code is set.
 - Bug 1777672 - Gracefully handle null nickname in CERT_GetCertNicknameWithValidity.