Minor tweaks for cross-compiling

Still a long way from working, of course.

The configure script now runs to finish on Linux with --host=mingw32.

It is no longer an error if Windows SDK or DirectX SDK are not found
by the logic in the configure script. It might well be that the user
has included relevant -I and -L flags in CC or CXX that makes the
compilations work anyway, or something. We should not try to be too
clever and try to predict how the compiler or linker work in the
configure script.

We now define the FOO_FOR_BUILD environment variables in set_soenv.in
even when not cross-compiling (identically as the plain FOO ones in
that case, obviously). This should make some makefiles and stuff that
build tools to run on the build host a bit simpler.

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