RFR: 8279337: The MToolkit is still referenced in a few places

[Sergey Bylokhov]

The MToolkit (motif toolkit) was removed in jdk7, but it is still referenced in a few places.

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Commit messages:
 - more cases
 - Delete the mtoolkit

Changes: https://git.openjdk.java.net/jdk/pull/6939/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6939&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8279337
  Stats: 114 lines in 18 files changed: 5 ins; 57 del; 52 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6939.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6939/head:pull/6939

PR: https://git.openjdk.java.net/jdk/pull/6939