OSX compilation fix: #include missing <math.h> and use std::isnan.
OSX compilation fix: #include missing <math.h> and use std::isnan.

isnan isn't really in std::, I don't know what's oing on with this one.
Hopefully this works in linux...


git-svn-id: fb6d863945102bebb9fe1d25d24b18a16295c170@2658 a436a847-0d15-0410-975c-d299462d15a1

drobilla/ingen,drobilla/ingen,drobilla/ingen,ventosus/ingen,ventosus/ingen,drobilla/ingen,ventosus/ingen,ventosus/ingen