Please unblock nspr 4.7.1-4

[Mike Hommey <mh@glandium.org>]

Hi release team,

Please unblock newest nspr release, that fixes #499146. The patch is a
bit big for what it does, but that is the patch that is going to be
applied upstream.
https://bugzilla.mozilla.org/attachment.cgi?id=339296
That's the only change in the package (well, it's dpatched so it's not
exactly that)

Mike