Add/remove MKIT_LOCAL as needed

utils/mkit/include/build.sh

@@ -26,6 +26,7 @@ build1() {
         *.md) <"$srcpath" expand_includes | expand_variables >"$dstpath" ;;
         *)    <"$srcpath"                   expand_variables >"$dstpath" ;;
     esac
+    mkdir -p "$MKIT_LOCAL"
     echo "$dstpath" >> "$MKIT_LOCAL/built.lst"
 }
 
@@ -38,6 +39,7 @@ build_manpages() {
             do
                 mdfile="$manfile.md"
                 ronn -r "$mdfile"
+                mkdir -p "$MKIT_LOCAL"
                 echo "$manfile" >> "$MKIT_LOCAL/built.lst"
             done
     else
@@ -53,6 +55,7 @@ clean() {
     test -f "$MKIT_LOCAL/built.lst" && {
         <"$MKIT_LOCAL/built.lst" xargs -r rm -f
         rm -f "$MKIT_LOCAL/built.lst"
+        rmdir --ignore-fail-on-non-empty "$MKIT_LOCAL"
     }
     true
 }