git: openjdk/jdk: 8296904: Improve handling of macos xcode toolchain

[Christoph Langer]

Changeset: 470f3424
Author:    Christoph Langer <clanger at openjdk.org>
Date:      2022-11-23 07:08:00 +0000
URL:       https://git.openjdk.org/jdk/commit/470f3424fcce0e41b75cccdd5e3a56771cd07ff5

8296904: Improve handling of macos xcode toolchain

Reviewed-by: erikj, ihse

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