changed the default value of --enable-libltdl to no

configure

@@ -1464,7 +1464,7 @@ Optional Features:
   --enable-dynamic-module enable dynamic module capability(default. yes)
   --enable-static-module  build modules statically into the main
                           library(default. no)
-  --enable-libltdl        use libltdl(default. yes)
+  --enable-libltdl        use libltdl(default. no)
 
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
@@ -19618,7 +19618,7 @@ fi
 if test "${enable_libltdl+set}" = set; then :
   enableval=$enable_libltdl; enable_libltdl_is=$enableval
 else
-  enable_libltdl_is=yes
+  enable_libltdl_is=no
 
 fi