Remove static const char copyright[]

We do not have copyright strings in our other executables for the other
copyright statements applicable to them, so these are rather exceptional.
They also cause build failures with OS X Xcode 5.1 and --enable-checking .

Reviewed-on: http://gerrit.openafs.org/10888
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Tested-by: Jeffrey Altman <jaltman@your-file-system.com>
(cherry picked from commit 3f189f8fe8cbb52aac4b7b5fe767d0de481cb569)

Change-Id: I11f878e4e4077bd242364810e1aaa473a36bc08c
Reviewed-on: http://gerrit.openafs.org/10923
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>