git: openjdk/jdk17u-dev: 8296904: Improve handling of macos xcode toolchain

[Christoph Langer]

Changeset: 57e6d92a
Author:    Christoph Langer <clanger at openjdk.org>
Date:      2022-12-09 17:02:00 +0000
URL:       https://git.openjdk.org/jdk17u-dev/commit/57e6d92a6ddbfe78cbf250a4502ce0911ee6f75a

8296904: Improve handling of macos xcode toolchain

Reviewed-by: mbaesken
Backport-of: 470f3424fcce0e41b75cccdd5e3a56771cd07ff5

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