internal/task: a few small correctness fixes

This shouldn't affect Linux or MacOS, but it's good to have them fixed.

src/internal/task/task_threads.c

@@ -41,8 +41,7 @@ void tinygo_task_init(void *mainTask, pthread_t *thread, int *numCPU, void *cont
     // Register the "GC pause" signal for the entire process.
     // Using pthread_kill, we can still send the signal to a specific thread.
     struct sigaction act = { 0 };
-    act.sa_flags = SA_SIGINFO;
-    act.sa_handler = &tinygo_task_gc_pause;
+    act.sa_handler = tinygo_task_gc_pause;
     sigaction(taskPauseSignal, &act, NULL);
 
     // Obtain the number of CPUs available on program start (for NumCPU).

src/internal/task/task_threads.go

@@ -220,7 +220,7 @@ func gcScanGlobals()
 var stackScanLock PMutex
 
 //export tinygo_task_gc_pause
-func tingyo_task_gc_pause() {
+func tingyo_task_gc_pause(sig int32) {
 	// Wait until we get the signal to start scanning the stack.
 	Current().state.gcSem.Wait()