tossim: put -I back in PFLAGS for micaz/sim

In the transition to the new make system I somehow forgot to include the
-I in each PFLAGS line in platforms/sim/micaz. This adds them which
should allow tossim to compile.
simplifications: bootstrapping binutils in patch (removes the dependency of autotools), no bootstrapping for gcc, and removed header overwriting in libc (diff showed that both of them is done in the tarball)
fixed datadir, simplified configure parameters (doesn't install to /usr/doc)