fix failed tests due to gcsafe

tests/async/tasyncexceptions.nim

@@ -28,11 +28,13 @@ proc serve() {.async.} =
     await processClient(fut)
 
 when isMainModule:
-  var fut = serve()
-  fut.callback =
-    proc () =
-      if fut.failed:
-        # This test ensures that this exception crashes the application
-        # as it is not handled.
-        raise fut.error
-  runForever()
+  proc main =
+    var fut = serve()
+    fut.callback =
+      proc () =
+        if fut.failed:
+          # This test ensures that this exception crashes the application
+          # as it is not handled.
+          raise fut.error
+    runForever()
+  main()

tests/async/tasynciossl.nim

@@ -5,7 +5,8 @@ discard """
 """
 import sockets, asyncio, strutils, times
 
-var disp = newDispatcher()
+var disp {.threadvar.}: PDispatcher
+disp = newDispatcher()
 var msgCount = 0
 
 when defined(ssl):