fixed isinf() and isfinite() fallbacks on Windows
fixed isinf() and isfinite() fallbacks on Windows

funkey/vigra,dstoe/vigra,funkey/vigra,dstoe/vigra,dstoe/vigra,dagophil/vigra,dstoe/vigra,dagophil/vigra,funkey/vigra,funkey/vigra,dagophil/vigra,dstoe/vigra,dagophil/vigra,dagophil/vigra,funkey/vigra,funkey/vigra,funkey/vigra,dstoe/vigra,dstoe/vigra,dagophil/vigra,dagophil/vigra