feat: add support for MacOS build with apple clang

[taedlar]

No description provided.

[Copilot]

Pull request overview

Adds macOS (Apple Clang) build support by tightening cross-platform portability in formatting/logging paths, adjusting build/link dependencies, and extending CMake presets/tests to better tolerate platform-specific socket timing behavior.

Changes:

• Added macOS ARM64 CMake configure/build/test presets and Apple-specific compiler warning flags.
• Introduced xvasprintf() portability wrapper and migrated call sites away from platform-specific vasprintf / _vscprintf branches; replaced unsafe sprintf with snprintf.
• Updated socket and string-related tests/logic to be more robust across platforms (accept/read polling, multibyte delimiter boundary handling).

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tests/test_string_operators/test_string_operators.cpp	Removes redundant free_svalue calls around stack reuse in string operator tests.
tests/test_socket_efuns/test_socket_efuns_behavior.cpp	Makes socket accept/read tests more timing-tolerant; rebinding strategy for deterministic port selection.
src/simulate.c	Routes fatal message formatting through xvasprintf() for portability.
src/main.h	Updates variadic logging macros to forward __VA_ARGS__ (portable variadic macro usage).
src/frame.cpp	Replaces sprintf with bounded snprintf.
src/comm.c	Uses xvasprintf() for add_vmessage() formatting.
lib/socket/CMakeLists.txt	Adjusts socket library link dependencies.
lib/port/xvasprintf.c	Adds new portable xvasprintf() implementation.
lib/port/wrapper.h	Exposes xvasprintf() in the portability wrapper API.
lib/port/debug.h	Updates logging macros to use standard variadic forwarding.
lib/port/CMakeLists.txt	Adds xvasprintf.c to the port library sources.
lib/lpc/CMakeLists.txt	Changes generator tool and lpc library link dependencies.
lib/lpc/array.c	Tightens multibyte delimiter matching conditions in explode_string().
CMakePresets.json	Adds macOS ARM64 build/test presets.
CMakeLists.txt	Adds Apple-specific compile warning options.