Setup libltdl in ltdl/, so we can use it in the dve2 interface.
Don't keep it under version control since it is installed by autoreconf. * configure.ac: Call LT_CONFIG_LTDL_DIR and LTDL_INIT. * README: Mention ltdl/. * Makefile.am: Recurse into ldtl. * iface/dve2/Makefile.am: Link with it.
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