java/openjdk17: generate more output during compilation

Prevents:
Creating support/modules_libs/java.base/server/libjvm.so from 989 file(s)

>> Killing runaway build after 7200 seconds with no output

The cmdlines output can also help in debugging the flapping builds if a
race condition is the cause of the 'nm' error. (see previous commits)

Reported-by: https://lists.freebsd.org/archives/freebsd-pkg-fallout/2025-September/807751.html

Plus, use --with-num-cores instead of --with-jobs. With-num-cores still
lets configure override (reduce) the number of parallel jobs if the
memory size is limited. With-jobs sets an absolute number.
See {WRKSRC}/doc/building.md for more information.

Reported-by: https://lists.freebsd.org/archives/freebsd-java/2025-September/003314.html

Bump portrevision so future failures are easy to trace back to specific
port version.