The docker-nobootstrap option uses bootstrap -D; thus, autotools are not required on the host for the build.

This enables building with centos-6 and the manylinux images based on centos-6 (https://github.com/pypa/manylinux).

Examples:

tox -e docker-manylinux-2014-standard
tox -e docker-manylinux-2014-standard-python3.9
tox -e docker-manylinux-2010-standard-i686-python3.8

Depends on #29929

CC: @kliem @slel

Component: porting

Author: Matthias Koeppe

Branch/Commit: 14da64d

Reviewer: Jonathan Kliem

Issue created by migration from https://trac.sagemath.org/ticket/30195