RFR: 8337667: sun/tools/jcmd/TestJcmdPIDSubstitution.java is failing on mac and windows

[Chris Plummer]

Limit testing `Compiler.perfmap` and `System.dump_map` to just linux because they are only supported on linux.

Tested by running just this one test on linux-x64-debug, linux-aarch64-debug, macosx-aarch64, macosx-x64-debug, and windows-x64-debug

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Commit messages:
 - limit some dcmds to just linux because they are only supported on linux.

Changes: https://git.openjdk.org/jdk/pull/20480/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20480&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8337667
  Stats: 6 lines in 1 file changed: 4 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/20480.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20480/head:pull/20480

PR: https://git.openjdk.org/jdk/pull/20480