[libvoikko] zhfst support on Windows

[Harri Pitkänen]

I was able to build a version of libvoikko for Windows where support for zhfst 
spellers was enabled. Unfortunately it seems that hfst-ospell does really not 
work on Windows.

Running "voikkospell.exe -l" when a zhfst speller is available will not crash 
but will consume 100% of the CPU until I stop it. Seems like it gets stuck in 
an infinite loop somewhere.

The same occurs if I run "hfst-ospell.exe sma-20130626.zhfst" so the bug does 
not seem to be in libvoikko.

If I move away all zhfst spellers then "voikkospell.exe -d fi-x-dialects" with 
the Malaga backend works just fine.

The next step would be to start debugging hfst-ospell.exe to figure out what 
is wrong with it. Unfortunately I have no useful debugging tools on my Windows 
laptop so I would need to start adding debugging output to various parts of 
hfst-ospell source to nail this bug. But right now I really don't have the 
time for that (I have already spent half of the weekend on this). So I'll get 
back to this when I have more time.

Harri