Provide a mechanism to disable `-dead_strip` in builds

[shs96c]

I've recently come across a failure to build gazelle that was ultimately traced down to commit a000b23a303edb7a614eba03cb4ea632225c8cde. I'm not a strong enough C++ developer to understand why that's happening, but I noticed that the commit message for this stated that:

This should be the right default for everyone, if not we can look at adding a way to disable it.

Having a flag to disable this feature would be most helpful.