math: isnan is a C99 feature
math: isnan is a C99 feature

Signed-off-by: Bernhard Reutner-Fischer <ce1ac9e9ad16abccd7821f371ad381197b4768ac@gmail.com>
Signed-off-by: Henning Heinold <13f185057069a88545ddfd120093968ca4a4b810@inf.fu-berlin.de>

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