Resolve symbol collisions among Wasm runtimes

[mathetake]

Migrated from envoyproxy/envoy#14012.

The more runtime we have, The more we want to have single binary to, at least, benchmark all at once.

Using objcopy --prefix-symbols on all the object files of runtimes might be a solution, though I'm not sure what changes would be necessary to be applied to C++ interfaces (V8 and WAVM for examples). Changes to the C interfaces would be trivial.
And This might have side effects in the final binary size?

Relevant to #113

[PiotrSikora]

I'm all in for fixing this issue, but do we have any real use case for it, other than benchmarks?

[mathetake]

No, I don't have any specific real use case. So this is going to be my weekend task when I have time until the real necessity comes up.

[mathetake]

I found that --prefix-symbols cannot be used for this purpose since it literally prefixes every symbol and we end up having something like my_prefix_pthread_mutex_unlock which is a mess. Instead, we can use redefine-sym for renaming every duplicated symbol and leaving others intact. I have a prototype in my local machine. Though I am not sure what we can do for Windows.