RFR: 8372360: Exclude jdk.jsobject from micros-javac input source packages

[Eric Caspole]

It appears that somewhere in the process of [JDK-8370227](https://bugs.openjdk.org/browse/JDK-8370227) the most recent change to the micros-javac got removed, this diff needs to be reapplied to exclude jdk.jsobject.

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Commit messages:
 - 8372360: Exclude jdk.jsobject from micros-javac input source packages

Changes: https://git.openjdk.org/jdk/pull/28459/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28459&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8372360
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/28459.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28459/head:pull/28459

PR: https://git.openjdk.org/jdk/pull/28459