Setting ReceiveBufferSize & SendBufferSize on Socket (Bug 16021 & Bug 12754)

Fixes :

https://bugzilla.xamarin.com/show_bug.cgi?id=16021
https://bugzilla.xamarin.com/show_bug.cgi?id=12754
    
Resolves:
    
http://lists.ximian.com/pipermail/mono-list/2013-June/050008.html
    
A reference to the variable bufsize, local to the else-if block was being passed to the function setsockopt hence
the properties ReceiveBufferSize & SendBufferSize were being set to garbage on the Socket class. This could and did have a SERIOUS performance hit on socket communication. It is not inconceivable that people would try 
    
Narinder Claire
narinder.claire <<at>> gmail.com