bug: recursive #includes without #pragma once cause a stack overflow

[thetayloredman]

Before we begin...

• I have updated the Zirco toolchain to the latest version
• I have searched the issue tracker for duplicates

What happened?

When a file includes itself and does not have #pragma once set, then a stack overflow results.

What version of Zirco are you running?

zrc_cli 0.1.0 (commit unknown, release build, macos [aarch64])

(25d8172 via Nix)

How can this bug be reproduced?

file.zr

#include "file.zr"

What behavior did you expect?

An error for recursive includes, or some better diagnostic

What actually happened?

thread 'main' has overflowed its stack
fatal runtime error: stack overflow, aborting
make: *** [dist/cmds/version.o] Abort trap: 6

Other Context

No response