RFR: 8304913: Use OperatingSystem, Architecture, and Version in jlink [v2]

[Roger Riggs]

> Refactor the Platform class of jlink to use jdk.internal.util OperatingSystem and Architecture instead of os.name and os.arch. 
> They are direct replacements for the Platform enums except for UNKNOWN; its use is refactored to report errors via exceptions.
> 
> Neither os.name nor os.arch should be assumed to be changeable; 
> one test case is removed because it assumes os.name can be changed on the command line.

Roger Riggs has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 28 commits:

 - Remove unused static methods in DefaultImageBuilder
 - Merge branch 'master' into 8304913-os-arch-jlink
 - Merge branch 'master' into 8304913-os-arch-jlink
 - Minor cleanup
 - Merge branch 'master' into 8304913-os-arch-jlink
 - 8304913: Use OperatingSystem, Architecture, and Version in jlink
 - Simplify exception handling
 - Simplify version parsing
 - 8306678: Replace use of os.version with an internal Version record
 - Use and test of "s390" verified by reviewer.
 - ... and 18 more: https://git.openjdk.org/jdk/compare/0c6529d2...5bf9a506

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Changes: https://git.openjdk.org/jdk/pull/13585/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13585&range=01
  Stats: 156 lines in 7 files changed: 16 ins; 110 del; 30 mod
  Patch: https://git.openjdk.org/jdk/pull/13585.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13585/head:pull/13585

PR: https://git.openjdk.org/jdk/pull/13585