fixed a bug in the name mangling code. It implicitly assumed that

fixed a bug in the name mangling code. It implicitly assumed that
mangling a name can't increase it's size which isn't true. (imagine a
file called "L B" which mangles to "LB~XX")

The symptoms were that users couldn't run batch files from short
directory names that contained non 8.3 characters (such as spaces).
(This used to be commit c319d8ea3f8b42bb3a8e501642971ed0bdb21583)