Log Message:
Update osh to 20090527, per maintainer update request by PR#41509.

Upstream changes between osh-20081213 and osh-20090527 follow:

osh bug fixes:

1) This release fixes an `echo' bug that causes `echo ""' to print an
   unnecessary diagnostic.

2) It also fixes a `sigign' bug that can cause incorrect signal ignoring
   behavior for subshells.

New osh features:

1) This release adds `cd' as a synonym for the `chdir' special command.

2) It also adds $m as a special parameter for the value of the MANPATH
   environment variable.