Rename LTDL_LDADD to LTDL_LIBS. Add ltdl library to sdk flags.
Rename LTDL_LDADD to LTDL_LIBS. Add ltdl library to sdk flags.

    * build-aux/urbi-with-ltdl.m4: Here.

aldebaran/libport,aldebaran/libport,aldebaran/libport,aldebaran/libport,aldebaran/libport