[PATCH] hurd libpthread: Copyright blurb updates

[Amos Jeffries]

This patch updates the copyright blurbs in libpthread repository to
match upstream glibc requested format.

Specific changes are:

 * use YYYY-2018 for copyright dates

 * replace obsolete FSF address with current gnu.org URL reference from
glibc.


Joseph also asked in the other thread for "Contributed by" lines not to
be added in new files. There are a few in this code, but the files
creation are usually very old - late 1990's early 2000's - so I am not
sure if they really qualify as "new".
 Should I remove or leave?

AYJ