Add support to build MinGW tools using Cygwin. This is a Canadian cross
build.
Do not expand the directives when parsing a configuration file. Hold
in the package object the text as read from the configuration file. Still
parse the logic but leave the macros. This allows a configuration to be
varied when the build happens. The Canadian cross uses this to build a
build compiler used to build a Cxc runtime.
Add Cxc support to the build module. In the defaults add rm and rmfile
macros, add Cxc paths and pre-build script code.
In the setbuilder check for a Cxc build and if so and the package
allow Cxc build the build host version then the host target
version.
Add cygiwn support to the defaults processing and to the Windows module.
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.
The git module allows basic access to git. Hosts are now required
to provide git support.
The defaults module now returns options as a list split on '='.
Remove the need to add the --force option. Also revert the force option
back to the --force from --no-force and leave it so the user can
bypass the host check of various packages.
Add arch build files. This allows archs to have different versions
and patches for specific tools.
Break the RTEMS config directory up into separate directories to
make long term maintenance easier. This required a change to config.py
to handle the config files being in subdirs of the config directory.
The defaults have been updated to include the install SB root so
packages built before a package are available.
Add makeinfo to the required tools. GDB (and others) need it to
build without error.
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.
