Blender Git Loki

BLI_math: unify zero area checks for barycentric weight calculation

This applies the change from T73348 fix to related functions.

Instead of checking against an epsilon to avoid divide by zero,
perform the division and check the result is finite.

This is needed since small faces can have an area under 'FLT_EPSILON',
and dividing by values close to zero can result in 'inf'.