Make gaussinv() static and public
Make gaussinv() static and public

It does not access any member so can be static. It is needed in the OpenCL
test spreadsheet to verify the results from the OpenCL implenentation of
NORMSINV.

Change-Id: I72c1f6e6c0c04c0e25f4779ab334158b8d4e371d

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core