iru-

Conditionals design and implementation

8

There are at least two differing semantics for IF and the words that build on it: 1. **classical**: IF consumes the top of the stack and branches on false (usually...

`np.walk` should probably return a status, instead of raising an error as in https://github.com/iru-/lua9p/blob/master/9p.lua#L363.

Currently the code space on x86_64 is always mapped as rwx. It would be nice to have it r-x when executing and rw- when compiling.

As a variadic argument, it should be stored in the stack, not on a register.

This fixes the failure to build src/interpreter.ns due to not finding last-signal. While here, update copyright year for recently touched files. Close #41

CI is [currently failing](https://github.com/iru-/nopforth/actions/runs/9211880069/job/25342265134) because `last-signal` is not defined for platforms that don't support signal handling. Even without signal handling nop should run just fine.