Use recv() and send() for socket communication on VMS instead of read()

and write().  The reason is that read() and write() make additional record
level locking which causes hangs of Compaq Secure Web Server (Apache) with
SSL.
Submitted by Compaq.

e_os.h

@@ -160,6 +160,13 @@ extern "C" {
 #define closesocket(s)		MacSocket_close(s)
 #define readsocket(s,b,n)	MacSocket_recv((s),(b),(n),true)
 #define writesocket(s,b,n)	MacSocket_send((s),(b),(n))
+#elif defined(VMS)
+#define get_last_socket_error() errno
+#define clear_socket_error()    errno=0
+#define ioctlsocket(a,b,c)      ioctl(a,b,c)
+#define closesocket(s)          close(s)
+#define readsocket(s,b,n)       recv((s),(b),(n),0)
+#define writesocket(s,b,n)      send((s),(b),(n),0)
 #else
 #define get_last_socket_error()	errno
 #define clear_socket_error()	errno=0