ENH: add canCompile test to RunFunctions

- allow conditional skipping of tutorials (for example) if wmake or
  the expected compiler is not available

tutorials/incompressible/pimpleFoam/laminar/contaminatedDroplet2D/Allrun

@@ -3,6 +3,12 @@ cd "${0%/*}" || exit                                # Run from this directory
 . ${WM_PROJECT_DIR:?}/bin/tools/RunFunctions        # Tutorial run functions
 #------------------------------------------------------------------------------
 
+if ! canCompile
+then
+    echo "skipping tutorial $PWD"
+    exit 0
+fi
+
 m4 < ./system/blockMeshDict.m4 > ./system/blockMeshDict
 
 runApplication blockMesh

tutorials/incompressible/pimpleFoam/laminar/planarPoiseuille/Allrun

@@ -15,6 +15,12 @@ then
     endTime=25
 fi
 
+if ! canCompile
+then
+    echo "skipping tutorial $PWD"
+    exit 0
+fi
+
 #------------------------------------------------------------------------------
 
 # Compute the case in 'serial' mode, and collect the data

tutorials/incompressible/pimpleFoam/laminar/sloshing2D/Allrun

@@ -3,6 +3,12 @@ cd "${0%/*}" || exit                                # Run from this directory
 . ${WM_PROJECT_DIR:?}/bin/tools/RunFunctions        # Tutorial run functions
 #------------------------------------------------------------------------------
 
+if ! canCompile
+then
+    echo "skipping tutorial $PWD"
+    exit 0
+fi
+
 runApplication blockMesh
 runApplication makeFaMesh