lots of small changes

tests/async/t7192.nim

@@ -9,6 +9,6 @@ import asyncdispatch
 proc testCallback() =
   echo "testCallback()"
 
-when isMainModule:
+when true:
   callSoon(testCallback)
   poll()

tests/async/tasyncexceptions.nim

@@ -27,7 +27,7 @@ proc serve() {.async.} =
     var fut = await accept()
     await processClient(fut)
 
-when isMainModule:
+when true:
   proc main =
     var fut = serve()
     fut.callback =

tests/async/tasyncrecursion.nim

@@ -15,7 +15,7 @@ proc asyncRecursionTest*(): Future[int] {.async.} =
     inc(result, await asyncRecursionCycle(i))
     inc(i)
 
-when isMainModule:
+when true:
   setGlobalDispatcher(newDispatcher())
   var i = waitFor asyncRecursionTest()
   echo i