Linking an rlib to a dylib may not include native deps

[alexcrichton]

An example showing off this behavior in a gist: https://gist.github.com/anonymous/633c83a89bb6bf479573

This is similar to #15460 which was fixed with the whole-archive option to the linker, and it will likely require the same fix when linking rlibs to a dynamic library to solve this problem as well.

[alexcrichton]

cc #14344, also very similar.