Add windows guards for nonblock sockets specs

library/socket/tcpserver/accept_spec.rb

@@ -115,10 +115,12 @@
         @socket.should be_an_instance_of(TCPSocket)
       end
 
-      it "returns a TCPSocket which is set to nonblocking" do
-        require 'io/nonblock'
-        @socket = @server.accept
-        @socket.should.nonblock?
+      platform_is_not :windows do
+        it "returns a TCPSocket which is set to nonblocking" do
+          require 'io/nonblock'
+          @socket = @server.accept
+          @socket.should.nonblock?
+        end
       end
 
       it "returns a TCPSocket which is set to close on exec" do

library/socket/tcpsocket/initialize_spec.rb

@@ -72,10 +72,12 @@
         @client.remote_address.ip_port.should    == @server.local_address.ip_port
       end
 
-      it "creates a socket which is set to nonblocking" do
-        require 'io/nonblock'
-        @client = TCPSocket.new(ip_address, @port)
-        @client.should.nonblock?
+      platform_is_not :windows do
+        it "creates a socket which is set to nonblocking" do
+          require 'io/nonblock'
+          @client = TCPSocket.new(ip_address, @port)
+          @client.should.nonblock?
+        end
       end
 
       it "creates a socket which is set to close on exec" do

library/socket/udpsocket/initialize_spec.rb

@@ -30,10 +30,12 @@
     @socket.binmode?.should be_true
   end
 
-  it 'sets the socket to nonblock' do
-    require 'io/nonblock'
-    @socket = UDPSocket.new(:INET)
-    @socket.should.nonblock?
+  platform_is_not :windows do
+    it 'sets the socket to nonblock' do
+      require 'io/nonblock'
+      @socket = UDPSocket.new(:INET)
+      @socket.should.nonblock?
+    end
   end
 
   it 'sets the socket to close on exec' do