Use CPPUNIT_ASSERT_DOUBLES_EQUAL

...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
diff --git a/sc/qa/unit/ucalc_formula.cxx b/sc/qa/unit/ucalc_formula.cxx
index a8e9100..3c23d47 100644
--- a/sc/qa/unit/ucalc_formula.cxx
+++ b/sc/qa/unit/ucalc_formula.cxx
@@ -6596,8 +6596,8 @@ void Test::testFuncMDETERM()
        aFormulaBuffer[12] = aColCodes[nSize-1];
        aFormulaBuffer[13] = static_cast<sal_Unicode>( '0' + nSize );
        m_pDoc->SetString(aPos, aFormulaBuffer.toString());
        CPPUNIT_ASSERT_EQUAL_MESSAGE("Calculation of MDETERM incorrect for singular integer matrix",
                                     0.0, m_pDoc->GetValue(aPos));
        CPPUNIT_ASSERT_DOUBLES_EQUAL_MESSAGE("Calculation of MDETERM incorrect for singular integer matrix",
                                     0.0, m_pDoc->GetValue(aPos), 10e-4);
    }

    int aVals[] = {23, 31, 13, 12, 34, 64, 34, 31, 98, 32, 33, 63, 45, 54, 65, 76};