fix singlequote.sh test to work in dash/bash/shsh.
fix singlequote.sh test to work in dash/bash/shsh.

Ignore-this: 1dbe54c8f0537cf982f5ad0a0d37d66f67063205

darcs-hash:20090228235813-72aca-e23ff9f6ba7f38b696171562f211cf9b796c9fb8

shicks/shsh,shicks/shsh