With Windows XP SP2 the current working directory was only
used as a last resort for loading DLL's. This caused problems
when incompatible libraries were installed into the system
directory or to be found in PATH. Kleowrap now prefers
the working directory.

* src/kleowrap.c (kleowrap_set_dll_directory): New.
* src/kleowrap.c (main): Use kleowrap_set_dll_directory.
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To be compatible with Windows XP < SP2 this is done conditionally
by GetProcAddress.