RFR: 8317012: Explicitly check for 32-bit word size for using libatomic with zero

[Magnus Ihse Bursie]

In libraries.m4, there is a long list of known 32-bit CPU architectures as a condition for using libatomic with zero. We should just check the address size instead.

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Commit messages:
 - 8317012: Explicitly check for 32-bit word size for using libatomic with zero

Changes: https://git.openjdk.org/jdk/pull/24515/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24515&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8317012
  Stats: 8 lines in 1 file changed: 0 ins; 6 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/24515.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24515/head:pull/24515

PR: https://git.openjdk.org/jdk/pull/24515