STYLE: change makeOption to makeType internally

- also simplify setting makeType in the Allwmake scripts

src/mesh/Allwmake

@@ -1,9 +1,9 @@
 #!/bin/sh
 cd ${0%/*} || exit 1    # run from this directory
-[ $# -ge 1 ] && makeOption=$1 || makeOption=libso
+makeType=${1:-libso}
 set -x
 
-wmake $makeOption autoMesh
-wmake $makeOption blockMesh
+wmake $makeType autoMesh
+wmake $makeType blockMesh
 
 # ----------------------------------------------------------------- end-of-file