Disable async macro code output. Added some WSA error codes to winlean.

lib/pure/asyncdispatch.nim

@@ -922,7 +922,7 @@ macro async*(prc: stmt): stmt {.immediate.} =
 
   result[6] = outerProcBody
 
-  echo(toStrLit(result))
+  #echo(toStrLit(result))
 
 proc recvLine*(socket: TAsyncFD): PFuture[string] {.async.} =
   ## Reads a line of data from ``socket``. Returned future will complete once

lib/windows/winlean.nim

@@ -657,7 +657,12 @@ type
     D4*: array [0..7, int8]
 
 const
-  ERROR_IO_PENDING* = 997
+  ERROR_IO_PENDING* = 997 # a.k.a WSA_IO_PENDING
+  WSAECONNABORTED* = 10053
+  WSAECONNRESET* = 10054
+  WSAEDISCON* = 10101
+  WSAENETRESET* = 10052
+  WSAETIMEDOUT* = 10060
 
 proc CreateIoCompletionPort*(FileHandle: THANDLE, ExistingCompletionPort: THANDLE,
                              CompletionKey: DWORD,