java/openjdk*: use proccontrol and elfctl

[2khramtsov_gmail.com]

Summary

JDK uses runtime WX pages for JIT, so use proccontrol for bootstrap JDK
to opt out from protmax, opt in to wxmap (lacks NT_FREEBSD_FEATURE_CTL)
and also for later in the build stage when built Java compiler is run.

Opt out from protmax and opt in for wxmap for built binaries.

[glewis]

How widely was this tested? The JDK can be finicky about memory management