fix(macOS): destroy EGL context via EGL, not SDL_GL_DeleteContext (shutdown crash)

On macOS the Zink/KosmicKrisp bootstrap stores the EGL context in
glContext (glContext = (SDL_GLContext)g_eglContext). DestroyWindowAndContext
then passed it to SDL_GL_DeleteContext, which treats an EGL context as an
SDL/native GL context and crashes on quit (SIGSEGV in SDL
DispatchedDeleteContext -> CGlobalRendering::~CGlobalRendering). Call the
existing DestroyEGLContext() on __APPLE__ instead. The game rendered fine;
it only crashed during shutdown.

Author: Mearman

rts/Rendering/GlobalRendering.cpp

@@ -992,9 +992,18 @@ void CGlobalRendering::DestroyWindowAndContext() {
 	SDL_DestroyWindow(sdlWindow);
 
 	#if !defined(HEADLESS)
+	#if defined(__APPLE__)
+	// On macOS, glContext holds the EGL context (set in InitGL via the Zink/
+	// KosmicKrisp bootstrap), not an SDL/native GL context. Passing it to
+	// SDL_GL_DeleteContext treats an EGL context as an SDL one and crashes on
+	// shutdown (DispatchedDeleteContext dereferences a bad pointer). Tear it
+	// down through EGL instead.
+	DestroyEGLContext();
+	#else
 	if (glContext)
 		SDL_GL_DeleteContext(glContext);
 	#endif
+	#endif
 
 	sdlWindow = nullptr;
 	glContext = nullptr;