Well, I'm definitely not a libtool expert, but I think the reason is the a same, as I stated in gentoo bug 221879. Previously, libtool docs suggested, that AC_LIBLTDL_CONVENIENCE can be called without AC_WITH_LTDL. While it did work in most cases, I think it was not-quite-correct in the first place (I'd like some comment on that from libtool devs). And of course, there's still that issue of incompatibility of handling AC_CONFIG_SUBDIRS(libltdl) between libtool 1.5 and 2.
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