Make it build again for non-local use.

Using colons (:) in the version string creates Makefile problems:

Makefile:195: *** multiple target patterns. Stop.
make: *** [build] Error 2

Merge the canadian branch to default.

Now the preliminray support for canadian-crosses is done,
merge to default. The few remaining quirks, if any, will
be resolved on mainstream.

[samples] Add a linux -> mingw32 -> i686-linux canadian sample

Add a sample that builds on Linux a mingw32-hosted toolchain that
generates code for i686-none-linux-gnu.

Signed-off-by: Bart van der Meulen <bartvdrmeulen@gmail.com>

[samples] Don't mix canadian samples with non-canadian ones.

- save the canadian smples in their own way, so as not to
mix non-canadian samples with canadian ones
- list canadian samples with the host information

Cleanup the handling of canadian settings

Bring handling the 'canadian' settings as par with the existing
'cross' settings.

Add support code for the canadian-cross case.

Add implementation for a candadian build option already
present in crosstool in order to build a cross-compiler
where build != host != target

Signed-off-by: Bart van der Meulen <bartvdrmeulen@gmail.com>

[samples] Make saveSample.sh a little bit more generic

Prepare saving canadian samples by making the saveSample.sh script
a little bit more generic, using conditional code-paths (even if
there's currently a single code-path).

Don't use prefix/bin to install the buildtools.

Collect the build tools in a seperate folder in order to prevent accidental
calling our newly build tools.

Signed-off-by: Bart van der Meulen <bartvdrmeulen@gmail.com>

Fix MPFR build to recognise the Mingw32 case.

Once we have canadian in place, Mingw32 can be a legitimate host,
so we have to recognise that along with Cygwin.

Also fix recognising Cygwin hosts.

Signed-off-by: Bart van der Meulen <bartvdrmeulen@gmail.com>

Use configured shell in all build-tools wrappers

Abide by the user's wish to use dash as shell in
build-tools wrappers, instead of plain /bin/sh.