bootstrap: Drop unused KWSys header directories

KWSys no longer needs the cmsys/{ios,stl} directories so we no longer
populate them.  We no longer need to create them either.

bootstrap

@@ -702,13 +702,6 @@ if [ ! -d "cmsys" ]; then
   cmake_error 4 "Cannot create directory ${cmake_bootstrap_dir}/cmsys"
 fi
 
-for a in stl ios; do
-  [ -d "cmsys/${a}" ] || mkdir "cmsys/${a}"
-  if [ ! -d "cmsys/${a}" ]; then
-    cmake_error 5 "Cannot create directory ${cmake_bootstrap_dir}/cmsys/${a}"
-  fi
-done
-
 [ -d "cmIML" ] || mkdir "cmIML"
 if [ ! -d "cmIML" ]; then
   cmake_error 12 "Cannot create directory ${cmake_bootstrap_dir}/cmIML"