...to avoid failure on Linux-rpm_deb-x86@71-TDF-dbg:

  ucalc_formula.cxx:6600:Assertion
  Test name: Test::testFuncMDETERM
  equality assertion failed
  - Expected: 0
  - Actual  : 6.33716169817777e-17
  - Calculation of MDETERM incorrect for singular integer matrix

A delta of 10e-4 appears to be a popular choice in this source file already.

Change-Id: I24dc6bcab114a1cb2183f2b583be7ba9a9cb1fcd