security/zeek: Unbreak armv7 build and fix testport issue

Add a patch from upstream to fix building on armv7 (used by pfsense):

https://github.com/zeek/zeek/issues/1496

Thanks to @garga for the pointer.

Fix a testport "left over" file @adridg reported. When zeek is run
as part of package installation, it copies some config files to
spool/installed-scripts-do-not-touch/site and local.zeek.sample
hitches a ride and needs to be removed on uninstall. But it is not
really a @sample candidate.

While we're here fix some minor portlint (env -> ${SETENV}) and
clean up some commented out directives.

Reported by: garga adridg