[jdk11u-dev] RFR: 8315480: [11u] Harmonize GHA cross-compilation block with mainline

[Aleksey Shipilev]

Parts of this block were rewritten with RISC-V GHA integration ([JDK-8283929](https://bugs.openjdk.org/browse/JDK-8283929)). Since we don't expect RISC-V to integrate any time soon, we could just roll in the rewrite without RISC-V parts to 11u, and this minimize the difference to mainline.

This would allow other clean backports.

Additional testing:
 - [ ] GHA (cross-compilation still works)

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Commit messages:
 - Fix

Changes: https://git.openjdk.org/jdk11u-dev/pull/2111/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2111&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315480
  Stats: 18 lines in 1 file changed: 12 ins; 4 del; 2 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2111.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2111/head:pull/2111

PR: https://git.openjdk.org/jdk11u-dev/pull/2111