build: disable WebSocket support with Boost 1.87.0 and later

The WebSocket++ library is incompatible with the recently released
Boost 1.87.0 (and presumably all future versions) and is unlikely
to be fixed any time soon.

Change-Id: Ic81f658a4f89ac3f1d9e61fca9742169f9604cb9

wscript

@@ -130,7 +130,10 @@ def configure(conf):
                              errmsg='not found, but required for Ethernet face support. '
                                     'Specify --without-libpcap to disable Ethernet face support.')
 
-    conf.checkWebsocket()
+    # WebSocket++ is incompatible with Boost 1.87.0
+    # https://github.com/zaphoyd/websocketpp/issues/1157
+    if conf.env.BOOST_VERSION_NUMBER < 108700:
+        conf.checkWebsocket()
 
     conf.check_compiler_flags()