rpcrt4/test: change a skip to win_skip

[Austin English]

-- 
-Austin
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diff --git a/dlls/rpcrt4/tests/rpc.c b/dlls/rpcrt4/tests/rpc.c
index 725dbba..128391d 100644
--- a/dlls/rpcrt4/tests/rpc.c
+++ b/dlls/rpcrt4/tests/rpc.c
@@ -335,7 +335,7 @@ static void test_towers(void)
     if (ret == RPC_S_INVALID_RPC_PROTSEQ)
     {
         /* Windows Vista fails with this error and crashes if we continue */
-        skip("TowerConstruct failed, we are most likely on Windows Vista\n");
+        win_skip("TowerConstruct failed, we are most likely on Windows Vista\n");
         return;
     }