Do the win32 detection more sensibly
Do the win32 detection more sensibly

Do it in the way suggested by the autoconf manual

darcs-hash:20070201140731-b4c10-af7c840d2a2ce3e8b25252b3851359f612939f09.gz

thiagoarrais/gtk2hs,thiagoarrais/gtk2hs,thiagoarrais/gtk2hs