RFR: 8282943: Unused weird key in compiler.properties

[Jan Lahoda]

There is a weird key in `compiler.properties` in javac. This key is, to my knowledge, unused, so the proposal is to remove it.

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Commit messages:
 - 8282943: Unused weird key in compiler.properties

Changes: https://git.openjdk.java.net/jdk/pull/7929/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7929&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282943
  Stats: 4 lines in 2 files changed: 0 ins; 4 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7929.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7929/head:pull/7929

PR: https://git.openjdk.java.net/jdk/pull/7929