Macos support into main (#228)

* macos: add x86_64 Intel support

* (feat) Apple Silicon macOS CI building and Setup.pkg documentation (#118)

* docs(macos): document Setup.pkg installation

Add Apple Silicon macOS CI coverage for runtime configuration, substrate tests, and Setup.pkg packaging alongside the macOS installation instructions.

* macos: pin Apple Silicon deployment target

* fix(macos): restore Retro Rewind local builds

* macos: package universal setup tools

* ci: build macOS input expression tests

* runtime: Do not force 14.0 minimum anymore

new minimum is 12.0

* macos: support older libc++ algorithms

* macos: allow undefined MTLLogStateDescriptor for older SDKs

* tests: deflake input expression timing window test

* build: Fix mac tests

* translator: emit null statement after continuation labels for C++17 compatibility

* feat(macos): add MetalFX spatial upscaling

* Fix automatic music muting on macOS

Co-Authored-By: Michael G <10155689+DarthMDev@users.noreply.github.com>
Co-Authored-By: Daan Vervacke <23398694+DaanVervacke@users.noreply.github.com>

* Address CodeRabbit review comments and integrate upstream TLS cmake

* Remove version requirement for running package CI

Co-Authored-By: Michael G <10155689+DarthMDev@users.noreply.github.com>

* publish-app: fix dependency discovery from build dir, handle spaces in paths, and fail on missing deps

* publish-app: preserve subdirectory suffix during @rpath dependency lookup

* cmake: synchronize CMAKE_SYSTEM_PROCESSOR with CMAKE_OSX_ARCHITECTURES on macOS

* fix rpaths

---------

Co-authored-by: DarthM <mgracer48@yahoo.com>
Co-authored-by: Michael G <10155689+DarthMDev@users.noreply.github.com>
Co-authored-by: Daan Vervacke <23398694+DaanVervacke@users.noreply.github.com>
Co-authored-by: patchzyy <64382339+patchzyy@users.noreply.github.com>

runtime/src/host_context.cpp

@@ -14,7 +14,7 @@
 
 extern "C" void mkw_co_switch(void** targetSp, void** sourceSp);
 extern "C" void* mkw_co_init(void* stackTop, void (*entry)(void*), void* argument);
-#elif defined(__linux__)
+#elif defined(__linux__) || (defined(__APPLE__) && defined(__x86_64__))
 #include <libco.h>
 
 #include <cstdlib>
@@ -158,7 +158,7 @@ void Switch(Handle target)
     g_current = source;
 }
 
-#elif defined(__linux__)
+#elif defined(__linux__) || (defined(__APPLE__) && defined(__x86_64__))
 
 namespace {
 struct Context {