Review Request (M) - 7157695 - Add windows implementation of socket interface

[Nils Eliasson]

http://cr.openjdk.java.net/~neliasso/7157695/webrev.01/ 
<http://cr.openjdk.java.net/%7Eneliasso/7157695/webrev.01/>

7157695 - Add windows implementation of socket interface

Using winsock api which is almost posix compatible. Also changing some 
argument types for the socket interface calls in os.hpp to make the 
platform independent code more platform independent. This made the win 
implementation possible without casts, and allowed me to remove a lot of 
redundant casts from the jni exports in jvm.cpp.