When using the set builder and nesting builds prpvide the nested
set builder and build objects with copies of the master defaults.
Python's variable sharing was sharing a single set of defaults
across all build sets and this resulted in popluted configurations.
Autoconf hard codes paths into itself. This change is a first
pass at allowing a clean environment to let automake build. The
ability to 'make install DESTDIR=xxx' autoconf then use it to
build automake needs a clean environment. The purpose is to
allow a prefix that needs root without building and packaging
when root.
By default the Source Builder now directly installs in the prefix and
does not create tar files. You need to supply options to create build
set level tar files and/or package level tar files.
A build set can invoke another build set. This allows an 'all'
type build set that builds all the RTEMS archs.
Change the get config call to return a map of paths and files.
Add per arch build sets as this is really what RTEMS needs. You
can then vary the version based on the architecture.
Add '%include' to the buildset files.
