libtool: surrender to Debian's castrated libtool
The libtool version distributed by Debian is patched to *not* propagate dependencies (i.e., if libA depends on libB, then linking against libA will not automatically link against libB, it has to be explicit), contrary to what the Libtool manual document. So now we explicitly link against both libA and libB in such case. * configure.ac: Remove the workaround that does not work for MinGW. * doc/org/compile.org: Mention the issue. * bin/Makefile.am, tests/Makefile.am, spot/ltsmin/Makefile.am, doc/org/g++wrap.in: Make the dependencies explicit.