ENH: collect arch-specific directly under platforms/

- platforms/WM_OPTIONS/lib
      old: lib/WM_OPTIONS

- platforms/WM_OPTIONS/bin
      old: bin/WM_OPTIONS
      old: applications/bin/WM_OPTIONS

A runtime environment nows needs
    - bin/
    - etc/
    - platforms/

bin/foamPack

@@ -73,13 +73,10 @@ do
 done
 
 # check for essential directories
-for dir in $packDir
-do
-    [ -d $dir ] || {
-        echo "Error: directory $dir does not exist" 1>&2
-        exit 1
-    }
-done
+[ -d $packDir ] || {
+    echo "Error: directory $packDir does not exist" 1>&2
+    exit 1
+}
 
 
 #------------------------------------------------------------------------------