Restore CreateImagePyramid openmp pragma
Restore CreateImagePyramid openmp pragma

Mistakenlly removed when trying to fix nondetermistic behavior.
The openmp pragma that was removed that preceded this one in the
code had a float reduction, which was nondeterministic.

However, there's nothing wrong with this one, so it should stay
in.

setsmdeveloper/SETSM,setsmdeveloper/SETSM,setsmdeveloper/SETSM