[jdk17u] RFR: 8298527: Cygwin's uname -m returns different string than before

[Christoph Langer]

Needed to resolve due to missing change for RISCV support.

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Commit messages:
 - Backport 51f0a1ce4b0d72cf7e82e01f7014274d8b7d1575

Changes: https://git.openjdk.org/jdk17u/pull/362/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u&pr=362&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298527
  Stats: 64 lines in 1 file changed: 33 ins; 30 del; 1 mod
  Patch: https://git.openjdk.org/jdk17u/pull/362.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u pull/362/head:pull/362

PR: https://git.openjdk.org/jdk17u/pull/362