enable Perl's strict and warnings in make-release

Declare the undeclared variables $help, $man, and @toCompress, delete
the duplicate declaration for $last, and remove the unused $tag
variable.

Change-Id: I33de42722b84207dc1bbad50539dc5bf92da2f5e
Reviewed-on: http://gerrit.openafs.org/10117
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>