win: exit instead of abort (#13138)

Calling abort on windows triggers the C++ runtime to attempt a debugger
attach, which causes the crashed runners to hang instead of exit, leading
to a timeout instead of a fast failure during discovery.

ml/backend/ggml/ggml/src/ggml.c

@@ -229,8 +229,13 @@ void ggml_abort(const char * file, int line, const char * fmt, ...) {
         fprintf(stderr, "%s\n", message);
         ggml_print_backtrace();
     }
-
+#if defined(_WIN32)
+    fflush(stderr);
+    fflush(stdout);
+    exit(1);
+#else
     abort();
+#endif
 }
 
 // ggml_print_backtrace is registered with std::set_terminate by ggml.cpp