auto-solib-add when attaching to inferior

["Kris Warkentin" <kewarken@qnx.com>]

When I run a remote process using our QNX remote protocol, I get a solib
breakpoint set properly and from then on, if solibs are loaded, their
symbols automatically get added (auto-solib-add is on by default).  If,
however, I attach to the process, even if auto-solib-add is on, I still have
to go 'shared' to get them to load.  If I 'maint info breakpoints' on the
attached process, I see that there isn't a shlib-events breakpoint set on
the attached process so I assume either enable_break() isn't getting called
or is failing.

I'm still building my debug gdb to test but I'm hoping someone will tell me,
"Oh, when you attach you should always call such-and-such function" and I
can just add it to our back end code.

cheers,

Kris