I haven't tried this, as we don't yet have the cross compilers
installed.

I managed to break this when refactoring things.

RedHat doesn't install all the tools with their full tuple, just GCC.  This
lets autoconf find the relevant tools.

Since users might not have MinGW installed on their target machines we
want to bundle all the necessary DLLs along with OpenOCD.  This does so.

You can now ask to build "*-gcc" to just get the GCC builds, or
"*-openocd" to just get the OpenOCD builds.