trouble is, that the functions we are using are "__stdcall" functions,
which are heavily decorated, and autotools is nice for checking __cdecl functions.

https://lists.gnu.org/archive/html/autoconf/2013-12/msg00019.html
> Normal practice for Windows ports is to simply assume that the
> requisite libraries are always present.

# Conflicts:
#	src/plugins/PluginFactory.cpp

This reverts commit fa34f20c.

to avoid hiding the window-title by default...