RFR: 8256418: Jittester make build is broken.

[Leonid Mesnik]

The Utils.java in lib depends on NetworkConfiguration.java now. So NetworkConfiguration.java should be added to the list.

Verified locally.

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Commit messages:
 - 8256418: Jittester make build is broken.

Changes: https://git.openjdk.java.net/jdk/pull/1238/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1238&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256418
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1238.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1238/head:pull/1238

PR: https://git.openjdk.java.net/jdk/pull/1238