[gold patch] Fix crash when a member of a lib group can't be opened

[Cary Coutant]

> This is OK.
>
> Note that ChangeLog should just say "readsyms.cc", not
> "gold/readsyms.cc".

Oops, I need to fix my script that generates ChangeLog entries. Fixed
that for all the other queued patches, too.

-cary