git: openjdk/jdk: 8325878: Require minimum Clang version 13

[Kim Barrett]

Changeset: 989fc3e6
Author:    Kim Barrett <kbarrett at openjdk.org>
Date:      2024-03-06 20:17:11 +0000
URL:       https://git.openjdk.org/jdk/commit/989fc3e6ea65e530055296ac4bc181cb5c6a41ea

8325878: Require minimum Clang version 13

Reviewed-by: jwaters, ihse

! doc/building.html
! doc/building.md
! make/autoconf/toolchain.m4