package/pure-ftpd: bump version to 1.0.51
Changelog: https://github.com/jedisct1/pure-ftpd/blob/master/ChangeLog
Updated copyright hash due to copyright year bump:
https://github.com/jedisct1/pure-ftpd/commit/cf1a9705c63ebc62735f99d4acf6dba117288abe
Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit ad54a80465d7c45827afa2ef20927883ebea6e62)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>