fallback to defining SDL_TriggerBreakpoint as __builtin_trap in older linux arm64 environments that do not have a __has_builtin facility

include/SDL3/SDL_assert.h

@@ -149,6 +149,8 @@ extern "C" {
     #define SDL_TriggerBreakpoint() __asm__ __volatile__ ( "bkpt #22\n\t" )
 #elif defined(_WIN32) && ((defined(__GNUC__) || defined(__clang__)) && (defined(__arm64__) || defined(__aarch64__)) )
     #define SDL_TriggerBreakpoint() __asm__ __volatile__ ( "brk #0xF000\n\t" )
+#elif defined(SDL_PLATFORM_LINUX) && ((defined(__GNUC__) || defined(__clang__)) && (defined(__arm64__) || defined(__aarch64__)) )
+    #define SDL_TriggerBreakpoint() __builtin_trap()  /* older arm linux environments may miss the SDL_HAS_BUILTIN(__builtin_trap) above */
 #elif defined(__386__) && defined(__WATCOMC__)
     #define SDL_TriggerBreakpoint() { _asm { int 0x03 } }
 #elif defined(HAVE_SIGNAL_H) && !defined(__WATCOMC__)