run-program issues with OpenJDK 11

[Eric Timmons]

It appears that java.lang.UNIXProcess was removed in OpenJDK 9 or
thereabouts, assuming I'm interpreting
https://github.com/openjdk/jdk/commit/aa6b19f38ee4dc69cac664d1211bff0e69b31f4c
correctly (/definitely/ not a Java developer here...).

This seems to make run-program unusable when using prebuilt jars on
recent JREs. Using the prebuilt 1.7.0 release and OpenJDK 11, I get the
errors shown in prebuilt-openjdk11.txt (attached).

If compiling using OpenJDK 11, run-program seems usable, but any attempt
to get the PID of a process gives the error in from-source-openjdk11.txt
(attached).

-Eric

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