PATCH to buildsym.c

[Jim Blandy]

I'm sympathetic to the concerns about possibly breaking other systems,
but I don't think it's good to put off changes with known benefits
just because we're not sure whether it might break something, though
we're not sure what.  It's sort of paralyzing to approach things that
way.

I think we should make the change, and comment the code with an
explanation of why it should be this way.  If it does break something
else, at least we can make a decision in the presence of data.

In any case, as the symtab maintainer, I think the change is okay.
When Stan turns out to be right, and the next Mars Lander mission
fails because they can't set a breakpoint where they need to, I'll
throw myself on my sword, okay?

Mark, you offered to commit the change, but do you really have commit
access to GDB?  I'm so out of touch...