[lworld] RFR: 8351432: [lworld] Update nsk/jvmti/GetObjectMonitorUsage/objmonusage007.java to don't faile with compilation error

[Leonid Mesnik]

The test is fixed to don't build itself code as a library

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Commit messages:
 - 8351432: [lworld] Update nsk/jvmti/GetObjectMonitorUsage/objmonusage007.java to don't faile with compilation error

Changes: https://git.openjdk.org/valhalla/pull/1391/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1391&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8351432
  Stats: 63 lines in 2 files changed: 19 ins; 42 del; 2 mod
  Patch: https://git.openjdk.org/valhalla/pull/1391.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1391/head:pull/1391

PR: https://git.openjdk.org/valhalla/pull/1391