libiconv.recipe: Remove libtool dependency
libiconv.recipe: Remove libtool dependency

When building as a build-tool, don't override ltmain.sh since that
forces a libtool dependency.

GStreamer/cerbero,nirbheek/cerbero,GStreamer/cerbero,GStreamer/cerbero,nirbheek/cerbero,GStreamer/cerbero,nirbheek/cerbero,nirbheek/cerbero,GStreamer/cerbero