[JDK-8294466](https://bugs.openjdk.org/browse/JDK-8294466) trimmed down the set of disabled warnings. Unfortunately it turned out that running slowdebug on linux on Oracle's CI triggered yet another warning in libsplashscreen.
------------- Commit messages: - 8295847: slow debug build error after JDK-8294466 Changes: https://git.openjdk.org/jdk/pull/10840/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10840&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8295847 Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jdk/pull/10840.diff Fetch: git fetch https://git.openjdk.org/jdk pull/10840/head:pull/10840 PR: https://git.openjdk.org/jdk/pull/10840
