Provide an API to return a static list of wrapped functions per DLL.

Now that thcrap and win32_utf8 are split into separate repositories, it makes
sense to move that manual list from thcrap to this project.

Previously, thcrap had to manually add every new wrapper here to its
win32_detour() function. And while this new approach doesn't save any typing
overall, it allows both projects to be more independent, with new functions
here automatically propagating to thcrap's locale independence feature.

And no, we still can't export a global variable by itself without messing
with __declspec, and that's bound to mess with static linking.