logwatch: remove pre-activate block

Was added in a9d72b0, adjusted in 9baab52; over 3 years have
passed since the issue necessitating the block was resolved.

security/logwatch/Portfile

@@ -90,18 +90,6 @@ post-destroot {
     ln -sf ${prefix}/share/${name}/scripts/logwatch.pl ${destroot}${prefix}/bin/logwatch
 }
 
-pre-activate {
-    # This port used to create a symlink directly in ${prefix} which was fixed in 7.4.1_1.
-    # The old unregistered symlink needs to be deleted from ${prefix} so upgrades work; fixed in 7.4.1_4.
-    # This can eventually be removed. Originally added 2014-10-01; fixed 2016-02-03.
-    set badfile ${prefix}/bin/${name}
-    if {![catch {file type ${badfile}}] && [registry_file_registered ${badfile}] == "0"} {
-        if {[catch {delete ${badfile}}]} {
-            ui_warn "Cannot delete ${badfile}; please remove it manually"
-        }
-    }
-}
-
 notes "
 A startup item has been generated that will aid in
 starting logwatch with launchd. It is disabled