Similarly to [JDK-8325163](https://bugs.openjdk.org/browse/JDK-8325163), this enables pedantic mode for gcc, ensuring stricter Standard conformance and allowing for buggy and broken code previously undetectable by gcc to be caught
------------- Commit messages: - Semicolon in compilerWarnings_gcc.hpp - compilerWarnings_gcc.hpp - 8325316 Changes: https://git.openjdk.org/jdk/pull/17727/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17727&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8325316 Stats: 5 lines in 2 files changed: 3 ins; 1 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/17727.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/17727/head:pull/17727 PR: https://git.openjdk.org/jdk/pull/17727
