[jdk17u-dev] RFR: 8277762: Allow configuration of HOTSPOT_BUILD_USER

[Andrew Leonard]

Adds support for configure argument --with-build-user=<build username>, which allows openjdk builds to use a generic username to allow deterministic "reproducible" build output.

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Commit messages:
 - Backport f41e768bba2b2ce3b3cc5813ccb1ac4984dcefbd

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/163/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=163&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8277762
  Stats: 17 lines in 2 files changed: 11 ins; 5 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/163.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/163/head:pull/163

PR: https://git.openjdk.java.net/jdk17u-dev/pull/163