libifconfig: Add a symbol map

[markj]

Summary

This is a no-op for now since libifconfig is only built as a static lib.

[kp]

lib/libifconfig/Symbol.map

3

Given that this is 13 or later, do we still need this?

[freqlabs]

I'm not familiar with how the symbol map works, but you've got the generated functions in there so that's good.

[markj]

lib/libifconfig/Symbol.map

3

I guess not. I'll remove it before committing.