Use dlopen? I haven’t tried this in Go, but if you want a binary that optionally includes features from an external library, you want to use dlopen to load it.
You can write your own dynamic loader, or port the one from libc, or attempt to statically link it (against its wishes). Nothing stops you opening a .so file and mmapping the appropriate sections - that's what the dynamic loader does, and it's just normal user-space code, after all. However, the libc dynamic loader definitely prefers to be your program's entry point. You're swimming against the current by doing it any other way.
