C++: make async tests green on Windows

compiler/sigmatch.nim

@@ -2231,14 +2231,14 @@ proc matchesAux(c: PContext, n, nOrig: PNode,
       else:
         m.state = csNoMatch
         return
-    
+
     if formal.typ.kind == tyVar:
-      let arg_converter = if arg.kind == nkHiddenDeref: arg[0] else: arg
-      if arg_converter.kind == nkHiddenCallConv:
-        if arg_converter.typ.kind != tyVar:
+      let argConverter = if arg.kind == nkHiddenDeref: arg[0] else: arg
+      if argConverter.kind == nkHiddenCallConv:
+        if argConverter.typ.kind != tyVar:
           m.state = csNoMatch
           m.mutabilityProblem = uint8(f-1)
-          return  
+          return
       elif not n.isLValue:
         m.state = csNoMatch
         m.mutabilityProblem = uint8(f-1)

lib/windows/winlean.nim

@@ -516,7 +516,7 @@ type
     fd_count*: cint # unsigned
     fd_array*: array[0..FD_SETSIZE-1, SocketHandle]
 
-  Timeval* = object
+  Timeval* {.importc: "timeval", header: "<time.h>".} = object
     tv_sec*, tv_usec*: int32
 
   AddrInfo* = object

tests/async/tasynctry.nim

@@ -6,6 +6,7 @@ Multiple idents in except
 Multiple except branches
 Multiple except branches 2
 '''
+targets: "c"
 """
 import asyncdispatch, strutils