When deleting dirs, don't emit errors if unable to remove a mounted dir.
When deleting dirs, don't emit errors if unable to remove a mounted dir.

rmdir() returns EBUSY only if the directory is mounted. If a user
has a directory mounted that appears in a plist, they will need
manual intervention to clean it up. This potentially could be
/usr or /var if packaging base, so just avoid the warning.

skoef/pkg,khorben/pkg,junovitch/pkg,en90/pkg,junovitch/pkg,en90/pkg,khorben/pkg,skoef/pkg,Open343/pkg,khorben/pkg,Open343/pkg