Let's expose all of our prefixed symbols. Instead of trying to have
fine-grained rules and only expose our public API, let's just expose
all symbols that won't cause a conflict.
Users won't be able to use the symbols without a proper header
declaration anyways. If they go through the process of re-defining
wlr_ symbols manually, that's on them if their build breaks.
This aligns the rules with [1].
[1]: https://github.com/swaywm/wlroots/pull/2969