RFR: 8329352: Remove dead code in splashscreen_sys.c

[Man Cao]

Hi all,

Could anyone review this trivial change to remove dead code in splashscreen_sys.c?

-Man

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Commit messages:
 - 8329352: Remove dead code in splashscreen_sys.c

Changes: https://git.openjdk.org/jdk/pull/18556/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18556&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8329352
  Stats: 29 lines in 1 file changed: 0 ins; 29 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18556.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18556/head:pull/18556

PR: https://git.openjdk.org/jdk/pull/18556