git: openjdk/jdk11u-dev: 8256182: Update qemu-debootstrap cross-compilation recipe

[Aleksey Shipilev]

Changeset: 299e6c8c
Author:    Aleksey Shipilev <shade at openjdk.org>
Date:      2021-11-08 09:21:18 +0000
URL:       https://git.openjdk.java.net/jdk11u-dev/commit/299e6c8c08ad4984937d6bd886020cc48afd5f6e

8256182: Update qemu-debootstrap cross-compilation recipe

Reviewed-by: sgehwolf
Backport-of: 421a7c3b41343e60d52b6d9ee263dfd0a4d53ce1

! doc/building.html
! doc/building.md