wip/verilator 5.026 NetBSD

Verilator is the fastest free Verilog HDL simulator, and outperforms most commercial simulators. Verilator compiles synthesizable SystemVerilog (generally not test-bench code), plus some SystemVerilog and Synthesis assertions into single- or multithreaded C++ or SystemC code. Verilator is designed for large projects where fast simulation performance is of primary concern, and is especially well suited to generate executable models of CPUs for embedded software design teams.