* tests/mdemo-shared.test, tests/mdemo-static.test: ditto
* tests/Makefile.am: ditto
* doc/libtool.texi: document them
* demo/Makefile.am, mdemo/Makefile.am (@STATIC@): do not use
-static unconditionally, it can't work with --disable-static
* demo/configure.in, mdemo/configure.in: check whether libtool was
configured to build static libraries and, if not, set STATIC to an
empty string
