RFR: 8353946: Incorrect WINDOWS ifdef in os::build_agent_function_name

[David Holmes]

Trivial fix to add missing underscore: WINDOWS -> _WINDOWS

When the original code was combined into a shared version, the ifdef around this windows-specific part was incorrect.

Testing: sanity builds only. Correctness is by inspection.

There are no tests for static agents that would exercise this code path.

Thanks.

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Commit messages:
 - 8353946: Incorrect WINDOWS ifdef in os::build_agent_function_name

Changes: https://git.openjdk.org/jdk/pull/24641/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24641&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8353946
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/24641.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24641/head:pull/24641

PR: https://git.openjdk.org/jdk/pull/24641