Put local functions inside anonymous namespace.

sc/source/core/tool/interpr5.cxx

@@ -1843,6 +1843,9 @@ void ScInterpreter::ScFrequency()
     pResMat->PutDouble(static_cast<double>(nDataSize-i), j);
     PushMatrix(pResMat);
 }
+
+namespace {
+
 // -----------------------------------------------------------------------------
 // Helper methods for LINEST/LOGEST and TREND/GROWTH
 // All matrices must already exist and have the needed size, no control tests
@@ -2229,6 +2232,8 @@ double lcl_GetSSresid(ScMatrixRef pMatX, ScMatrixRef pMatY, double fSlope,
     return fSum;
 }
 
+}
+
 // Fill default values in matrix X, transform Y to log(Y) in case LOGEST|GROWTH,
 // determine sizes of matrices X and Y, determine kind of regression, clone
 // Y in case LOGEST|GROWTH, if constant.