Binary translation when compressed instructions are enabled

[fwsGonzo]

Currently working on getting binary translation working with compressed instructions. This is the tracking issue.

• [x] Allow compiling with binary translation and C-ext enabled
• [x] Run binary translated fib.rv32gc and fib.rv64gc mini-programs
• [x] Run binary translated stream-rv64gc
• [x] Run binary translated unit tests with system rv64gc compiler

[fwsGonzo]

With https://github.com/fwsGonzo/libriscv/commit/255fbf360a98d3673be9252c7a87b7c3688442cd I can confirm the entire test-suite now completes successfully with C-extension enabled.