git: openjdk/jdk21u-dev: master: 8323008: filter out harmful -std* flags added by autoconf from CXX

[Goetz Lindenmaier]

Changeset: 64439376
Author:    Goetz Lindenmaier <goetz at openjdk.org>
Date:      2024-01-18 16:03:23 +0000
URL:       https://git.openjdk.org/jdk21u-dev/commit/644393769f453f9d2fad7f50b3ca44cd9ff72408

8323008: filter out harmful -std* flags added by autoconf from CXX

Backport-of: 68c4286026bc2c0ec0f594e0b96fe03fe5624d6d

! make/autoconf/toolchain.m4
! make/autoconf/util.m4