iverilog doesn't work when statically linked

[edbordin]

system.vpi implements core simulation functions and is dynamically linked to the VPI functions implemented in /lib/ivl/ivl. It doesn't work when ivl is statically linked. Options I can see:

• Ship dynamic binaries with their rpath manipulated to find bundled shared libs
• See if we can patch iverilog to compile in system.vpi

Until this is fixed I will stop shipping iverilog since there is no point.