MSVC doesn't like C bitfields.

Change-Id: I88a415e3dd7ac9ea2fa83ca3e4d835efefa7fcc6
Reviewed-on: https://boringssl-review.googlesource.com/7970
Reviewed-by: David Benjamin <davidben@google.com>
diff --git a/include/openssl/ssl.h b/include/openssl/ssl.h
index d3bf83a..960bc14 100644
--- a/include/openssl/ssl.h
+++ b/include/openssl/ssl.h
@@ -4091,10 +4091,10 @@
 
   /* recv_shutdown is the shutdown state for the receive half of the
    * connection. */
-  enum ssl_shutdown_t recv_shutdown : 2;
+  enum ssl_shutdown_t recv_shutdown;
 
   /* recv_shutdown is the shutdown state for the send half of the connection. */
-  enum ssl_shutdown_t send_shutdown : 2;
+  enum ssl_shutdown_t send_shutdown;
 
   int alert_dispatch;
   uint8_t send_alert[2];