Add stubs for the file locking functions for platforms where the concept isn't supported. (dm)
Add stubs for the file locking functions for platforms where the concept isn't supported. (dm)


git-svn-id: 30a5f035a20f1bc647618dbad7eea2a951b61b7c@5024 91a5dbb7-01b9-0310-9b5f-b28072856b6e

brltty/brltty,brltty/brltty,brltty/brltty,brltty/brltty,brltty/brltty,brltty/brltty