COMP: chtMultiRegion: avoid excess unused references. See #1726.

applications/solvers/heatTransfer/chtMultiRegionFoam/chtMultiRegionTwoPhaseEulerFoam/fluid/initContinuityErrs.H

 PtrList<uniformDimensionedScalarField> cumulativeContErrIO(fluidRegions.size());
 forAll(cumulativeContErrIO, i)
 {
-    #include "setRegionFluidFields.H"
+    const fvMesh& mesh = fluidRegions[i];
+
     cumulativeContErrIO.set
     (
         i,

applications/solvers/heatTransfer/chtMultiRegionFoam/fluid/initContinuityErrs.H

 PtrList<uniformDimensionedScalarField> cumulativeContErrIO(fluidRegions.size());
 forAll(cumulativeContErrIO, i)
 {
-    #include "setRegionFluidFields.H"
+    const fvMesh& mesh = fluidRegions[i];
+
     cumulativeContErrIO.set
     (
         i,