fix: error building codspeed rust with clang and when cross-compiling

[not-matthias]

No description provided.

[Copilot]

Pull Request Overview

Fix build issues with clang and cross-compilation by centralizing lightweight logging, adding libc compatibility shims, and expanding CI to validate multiple targets.

• Centralize printf binding in utils.zig and use it for error logging
• Add musl compatibility header and include it in generated C
• Replace a panic with printing + exit and add cross-compile CI job

Reviewed Changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/utils.zig	Adds a public C printf binding to avoid std.log/std.debug syscall usage.
src/c.zig	Switches error logs to utils.printf; removes local printf declaration.
src/bincode.zig	Replaces @Panic with utils.printf + process exit in invalidProtocol.
scripts/release.py	Injects compat.h into generated C for libc portability.
includes/core.h	Includes stdio.h for C compilation needs.
includes/compat.h	Introduces musl LFS64 compatibility macro mappings.
.github/workflows/ci.yml	Adds a cross-compile matrix using zig cc for many targets.

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[not-matthias]

Moved to #14