* TODO: Note some cleanups that are now needed.
* libltdl/configure.in: Use the new macroised tests.
* libltdl/ltdl.m4: New file, macroised tests formerly in
libltdl/configure.in.
Reported by Stephan Kulow <coolo@kde.org>.
* cdemo/main.c: "Welcome _to_ ..."
* mdemo/main.c: ditto
* libltdl/configure.in: support multiple dlopening mechanisms
at once
* libltdl/ltdl.c: prefix system dependent functions with "sys_"
to avoid symbol conflicts (libdld didn't work)
* libtool.m4 (AC_LIBLTDL_*): set INCLTDL to the path of ltdl.h
* ltconfig.in: check for dlopen with -ldl first