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Simply installs vanilla simics under sims/external/simics. Because of licensing
restrictions we cannot automatically download simics from the intel page.
Instead the makefile will prompt the user to download to files and add them to
the simics directory.

This commit does not include any simbricks integration at all yet.
Co-authored-by: Antoine Kaufmann <antoinek@mpi-sws.org>

Empty structs are not standard C and sizeof for them in gcc is zero but for c++
is 1.

But this time without the broken whitespace

all features to run femu with kvm

Includes legacy interrupts and programming interface field.