Pass in the --host argument to all of the various programs
that need to treat the configure scripts as cross compilation
targets.
This removes all dependencies on the host libc (issue #7)
and adds some tools to the initrd (cryptsetup #46).
This adds compilations modules for musl-libc and kernel-headers.
The entire initrd (busybox, cryptsetup, gpgv, kexec, etc) can be built
with the much smaller libc and it appears to work with chroot.
Library paths are not set correctly and files are installed into
heads/install to make them accessible to other modules. This prevents
the initrd from working without manual fixup; need to fix before
merging into master.
Build times have gone up since everything is being rebuilt more
often for some reason.
