NPN was removed from NSS a long time ago, this effectively does nothing.
ALPN also should be default-enabled (we do this by pref but the component
itself should have a sane default) so this was flipped as a drive-by fix.
Resolves#2723
This creates a number of stubs and leaves some surrounding code that may be irrelevant (eg. recorded time stamps, status variables).
Stub resolution/removal should be a follow-up to this.