RFR: 8339313: JDK-8338888 broke 32-bit builds

[Thomas Stuefe]

See JBS issue and comment history. GCC chokes on the native test code with bogus (AFAICS) fortify errors.

In any case, since this code should not be compiled for 32-bit anyway, I exclude it. Trivial?

Tested on x86 and x64. On x86, build succeeds, on x64 we still can run `runtime/exceptionMsgs/NoClassDefFoundError `successfully.

Ping @dholmes-ora

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Commit messages:
 - exclude for 32bit

Changes: https://git.openjdk.org/jdk/pull/20809/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20809&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8339313
  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/20809.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20809/head:pull/20809

PR: https://git.openjdk.org/jdk/pull/20809