Temporary workaround for unionfs issues

The latest incarnations of unionfs have issues appending
text via shell redirection, so to work around it, we can
touch the file before-hand to move it to the RW portion
of the union.

Signed-off-by: Aaron Griffin <aaronmgriffin@gmail.com>

makechrootpkg

@@ -170,6 +170,7 @@ fi
 
 if ! grep "^nobody" "$uniondir/etc/sudoers" >/dev/null 2>&1; then
     echo "allowing 'nobody' sudo rights in the chroot"
+    touch "$uniondir/etc/sudoers"
     echo "nobody	ALL=(ALL) NOPASSWD: ALL" >> "$uniondir/etc/sudoers"
     chmod 440 "$uniondir/etc/sudoers"
 fi