MFH: r522114 r522170 r522177 r522178

New port: cad/cascade-compiler: Just-In-Time Compiler for Verilog from VMware Research

cad/cascade-compiler: Update g20200104 -> g20200105

Tests now pass.

Fix build on GCC-based systems:

CMake Error in src/CMakeLists.txt:
Target "libcascade" requires the language dialect "CXX17" (with compiler
extensions), but CMake does not know the compile flags to use to enable it.

Approved by: portmgr (tier-2 blanket)

cad/cascade-compiler: Update g20200105 -> g20200105.1

Approved by: secteam