* ltmain.in: remove duplicates from deplibs, handle

* ltmain.in: remove duplicates from deplibs, handle
  interdependent libraries (e.g. -la -lb -la),
  this requires adding deplibs in reverse order

* ltmain.in: link dlpreopened libraries before other libraries
  (reported by Pavel Roskin)
* mdemo/Makefile.am: build and link libsub.la
* mdemo/sub.c: new file used by both dlopened modules
* mdemo/foo*: use sub() defined in libsub
* tests/dryrun.test: build libsub.la

* mdemo/Makefile.am: always link mdemo.static with -static
* mdemo/configure.in: ditto

* ltmain.in: fix dlopen/dlpreopening of objects

* ltmain.in (ILD): fix misplaced `continue' in -R* argument handler

* ltmain.in: merge duplicated code of clean and uninstall mode

* libtool.m4: recognize powerpc*linux* (reported by
  Dirk A. Mueller <dmuell@gmx.net>)