Investigate if we should provide explicit dwarf version to rust

[Vollbrecht]

There exist the extra flag -Zdwarf-version that is planed to be stabilized soon, that set the dwarf version used.

From memory esp-idf only uses dwarf v4 version. If we don't provide the specific version on the rust site i am not sure it will use the right version.

[Vollbrecht]

I found the context again. In the esp-idf build.cmake there is this gem indicating dwarf4 is used.

Unfortunately i could not find any github issue with the tracking number 5163 related to the note...