Make user-space libraries and programs

After lots and lots of research (and a few Voodoo dolls) I finally found the right options to make user-space compile, from libdrm to weston. The result even seems to be usable since it runs in the chroot! :)

It requires a bunch of packages to be installed either through the board or via chroot and a symlinks fixup to be done on the rootfs though. I am seeing whether this can be automated easily.

Good news, once the right variables and options are used, cross-compilation actually turns out to be rather clean and consistently successful.