Update configure checks for libwebsockets.

configure.ac

@@ -54,11 +54,11 @@ AC_ARG_WITH([libwebsockets],
   [with_libwebsocket=check])
 AS_CASE(["$with_libwebsockets"],
   [yes], 
-    [AC_CHECK_LIB(websockets,libwebsocket_create_context,[HAVE_LIBWEBSOCKETS=1])]
+    [AC_CHECK_LIB(websockets,lws_create_context,[HAVE_LIBWEBSOCKETS=1])]
     [AC_CHECK_HEADERS([libwebsockets.h])],
   [no], 
     [],
-    [AC_CHECK_LIB(websockets,libwebsocket_create_context,[HAVE_LIBWEBSOCKETS=1],[HAVE_LIBWEBSOCKETS=0])]
+    [AC_CHECK_LIB(websockets,lws_create_context,[HAVE_LIBWEBSOCKETS=1],[HAVE_LIBWEBSOCKETS=0])]
     [AC_CHECK_HEADERS([libwebsockets.h])]
   )
 AS_IF([test "$ac_cv_header_libwebsockets_h" != yes],[HAVE_LIBWEBSOCKETS=0],[])