[lldb][DWARFASTParserClang][ObjC] Remove workaround for old ObjC DWARF (#120218)

With all the recent versions of Clang that I tested, ObjC forward
declarations like
```
@class ForwardObjcClass;
```
don't emit the kind of DWARF that this workaround was put in place for.

Also, zero-sized structures are valid in C (and thus Objective-C), so
this workaround makes things confusing to reason about when mixing the
two languages.

This workaround has been in place for at least a decade, and given that
recent compilers don't produce this anymore, we think it's a good time
to remove it.

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