removes reference to old httpd dir

fix-old-htdocs.diff

diff --git a/configure.ac b/configure.ac
index c873775..7e0500b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -27,7 +27,6 @@ AC_CONFIG_FILES([
                  Makefile
                  src/Makefile
                  include/Makefile
-                 htdocs/Makefile
                  third-party/Makefile
                  plugins/Makefile
                  plugins/survival/mapgen/noise/Makefile