RFR: 8367027: java/lang/ProcessBuilder/Basic.java fails on Windows AArch64

[Saint Wesonga]

This test fails with errors like >'=C:=,=ExitValue=3,PROCESSOR_ARCHITECTURE=ARM64,SystemRoot=C:\Windows,'< not equal to '=C:=,=ExitValue=3,SystemRoot=C:\Windows,'

The test does not expect the PROCESSOR_ARCHITECTURE variable to be returned from the ProcessBuilder (called at https://github.com/openjdk/jdk/blob/431f46724658b703e995e518cb7a2149c50d6a9d/test/jdk/java/lang/ProcessBuilder/Basic.java#L127 for example). The fix is to treat it as an expected variable and strip it out from the results, similar to how macOS and AIX strip out their expected variables.

The winEnvFilter method needs to be updated because some checks like https://github.com/openjdk/jdk/blob/431f46724658b703e995e518cb7a2149c50d6a9d/test/jdk/java/lang/ProcessBuilder/Basic.java#L1694 have the output on separate lines as opposed to the inline comma-separated format where removeWindowsAArch64ExpectedVars is used.

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Commit messages:
 - java/lang/ProcessBuilder/Basic.java fails on Windows AArch64

Changes: https://git.openjdk.org/jdk/pull/27131/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27131&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367027
  Stats: 23 lines in 1 file changed: 21 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/27131.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27131/head:pull/27131

PR: https://git.openjdk.org/jdk/pull/27131