Core dumps allow setting solib-search-path

When I run core dump debugging session, I want to specify path for gdb where it will be searching for shared object files/symbols (set solib-search-path <PATH> command).

Simple checkbox that will cause setting the same path where binary is located would be enough (it is most common use case). Of cource we could use `Override start script` for that purpose but making file with such content for every session is not convenient.