Uic: remove unused option -3

Change-Id: I2ded3a3c90eea0ae37619ff39a8111a589c4573b
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Avoided zero devision in cube root approximation

Halley's method to get a better approximation is omitted, if it
would include a devision by zero (INFINITY/NaN is worse).

Change-Id: Ida09326e2b5892d7cb21bcb956631c289e5b56ba
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>