Copyright for nspr source package in Lunar

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: NSPR
Source: http://ftp.mozilla.org/pub/nspr/releases/

Files: *
Copyright: 1998-2000 Netscape Communications Corporation.
License: MPL-2.0
 On Debian systems the full text of the MPL-2.0 can be found in
 /usr/share/common-licenses/MPL-2.0.