BUILDFIX: linux build broken - abs() used instead of fabs()
BUILDFIX: linux build broken - abs() used instead of fabs()

linux caught the fact that we're using an integer absolute value function
when we should be using a floating-point version.

gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm