move more socket functions common to Winsock and BSD implementations to common code

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56938 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/private/fd.h

@@ -51,16 +51,4 @@
     #define wxFD_CLR(fd, fds) FD_CLR(fd, fds)
 #endif // __INTELC__/!__INTELC__
 
-// this is for Windows where configure doesn't define this
-#ifndef SOCKOPTLEN_T
-    #define SOCKOPTLEN_T int
-#endif
-
-/*
- * MSW defines this, Unices don't.
- */
-#ifndef INVALID_SOCKET
-    #define INVALID_SOCKET (-1)
-#endif
-
 #endif // _WX_PRIVATE_FD_H_