[CMake] Bug in FindJNI script when using Windows

[Timi Tuohenmaa]

Hi,

FindJNI script throws some errors (and probably does not work if Java
is installed in some way that it's path is not told in Windows
registers).

I did write a bug report about this, but I made it minor bug so no-one
seems to care.

http://public.kitware.com/Bug/view.php?id=9686

I hope this quite trivial bug is fixed in final 2.8 even though it
works in most cases (even though it prints lots of warnings).


Regards,
Timi Tuohenmaa