RFR: 8163229: test test/tools/javac/CaptureInSubtype.java has a main method that is never executed Export

[Archie L. Cobbs]

This PR deals with some housekeeping relating to compiler unit tests.

JDK-8163229 points out that there are several tests that have a `public static void main(String[])` method, but because the test expects to fail during compilation, the test is never actually run, and so these `main` methods are just clutter that can be removed.

However, there are also some tests where the test is never run, but the `main()` method generates one or more of the expected compilation errors. Obviously we need to keep those, but they don't need to be declared as `public static void main(String[])` which is misleading. So instead we rename these methods to `meth()`, and also we remove the `String[]` parameter when it's not needed by the test.

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Commit messages:
 - Rename or remove "main()" methods in tests that never actually run.

Changes: https://git.openjdk.org/jdk/pull/10992/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10992&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8163229
  Stats: 187 lines in 127 files changed: 0 ins; 68 del; 119 mod
  Patch: https://git.openjdk.org/jdk/pull/10992.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10992/head:pull/10992

PR: https://git.openjdk.org/jdk/pull/10992