Fix `GDBBreakpoint` description to support new-style breakpoint record ...which includes new field `locations` that contains all locations for a multi-location breakpoint. Previous versions printed more than one breakpoint on `=breakpoint-*` events (which was not valid MI syntax as documented). With this fix, `stx:libgdbs` supports both, the old and new records.

74c24ce4025136e9c5a859654fae426a74b1e2b3 stx-8.0.0