Integrated: 8346278: Clean up some flag handing in flags-cflags.m4

[Magnus Ihse Bursie]

On Mon, 16 Dec 2024 12:31:04 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> WARNING_CFLAGS_JVM should not be used to set arbitrary warning flags for Hotspot.
> 
> We do not need to check for gcc 6+ anymore.

This pull request has now been integrated.

Changeset: 30302309
Author:    Magnus Ihse Bursie <ihse at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/30302309155b91d1bb6a3a7295791d656d149788
Stats:     20 lines in 2 files changed: 0 ins; 15 del; 5 mod

8346278: Clean up some flag handing in flags-cflags.m4

Reviewed-by: erikj

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PR: https://git.openjdk.org/jdk/pull/22762