recent KahanSum change causes a new test failure on ppc64le

[Dan Horák <dan@xxxxxxxx>]

Hello,

seems the recent change [1] to KahanSum handling causes a test failure
on ppc64le.

Running scope as unit: -home-sharkcz-projects-libreoffice-workdir-CppunitTest-sc_statistical_functions_test.test:20230905152639:2378561.scope
[_RUN_____] StatisticalFunctionsTest::testStatisticalFormulasFODS
Testing load file:///home/sharkcz/projects/libreoffice//sc/qa/unit/data/functions/statistical/fods/KahanSum.fods:
/home/sharkcz/projects/libreoffice/sc/qa/unit/functions_test.cxx:49:StatisticalFunctionsTest::testStatisticalFormulasFODS
forced failure
- Testing file:///home/sharkcz/projects/libreoffice//sc/qa/unit/data/functions/statistical/fods/KahanSum.fods failed, Sheet2.A90 '=SUM(F3:F102)' result: 6.6, expected: 5

StatisticalFunctionsTest::testStatisticalFormulasFODS finished in: 389ms
functions_test.cxx:49:Assertion
Test name: StatisticalFunctionsTest::testStatisticalFormulasFODS
forced failure
- Testing file:///home/sharkcz/projects/libreoffice//sc/qa/unit/data/functions/statistical/fods/KahanSum.fods failed, Sheet2.A90 '=SUM(F3:F102)' result: 6.6, expected: 5

Failures !!!
Run: 1   Failure total: 1   Failures: 1   Errors: 0


[1] https://git.libreoffice.org/core/+/1f8cc7644293e62ad6430bbeec243d3283e478d7


	Thanks,

		Dan