Draft: Configure libcdi

Automatically generate libcdi configure script when when calling autoreconf -i in cdo root.

configure.ac

@@ -12,6 +12,7 @@ AC_DEFINE_UNQUOTED(CDO, ["$PACKAGE_VERSION"], [CDO version])
 CONFIG_ABORT=yes
 AC_CONFIG_AUX_DIR([config])
 AC_CONFIG_MACRO_DIRS([m4 libcdi/m4])
+AC_CONFIG_SUBDIRS([libcdi])
 AC_CANONICAL_HOST
 AC_CANONICAL_BUILD