Add support for tor2web mode via configure

configure.in

@@ -145,6 +145,13 @@ if test "$enable_local_appdata" = "yes"; then
             [Defined if we default to host local appdata paths on Windows])
 fi
 
+# Tor2web mode flag
+AC_ARG_ENABLE(tor2web-mode,
+     AS_HELP_STRING(--enable-tor2web-mode, support tor2web non-anonymous mode),
+[if test x$enableval = xyes; then
+    CFLAGS="$CFLAGS -D ENABLE_TOR2WEB_MODE=1"
+fi])
+
 AC_ARG_ENABLE(bufferevents,
      AS_HELP_STRING(--enable-bufferevents, use Libevent's buffered IO.))