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this gets rid of the non-fatal build error 'No names found, cannot describe anything'

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