www/node{18,20,22}: use proccontrol for JIT

[2khramtsov_gmail.com]

Summary

Opt out from protmax and opt in to wxmap when JIT=on to unbreak build
in restricted environment.

[2khramtsov_gmail.com]

oops, s/disabled/disable in www/node20

[sunpoet]

I don't think it is workable given that there is no USES=proccontrol in the ports tree.

[2khramtsov_gmail.com]

In D47091#1078103, @sunpoet wrote:

I don't think it is workable given that there is no USES=proccontrol in the ports tree.

Parent revision is still TBD, see review stack. Feel free to close if you prefer so.