Remove unused WLA-DX macro state variables
Fix WLA-DX compatibility with modern Clang
Fix WLA-DX build with CMake 4
Sync upstream to https://github.com/Chatterino/chatterino2/commit/bee30e6d81f8af6d9e3a605973c79e40b44925f0
README.md: improve instructions to delete previous build cache
Sync upstream to https://github.com/Chatterino/chatterino2/commit/fda51f0d3a4a5cd15f099b951b796e299d566e9e
Sync upstream to https://github.com/Chatterino/chatterino2/commit/76b983a5b20dfa5fb116dcc6ada1849ca28ba471
Sync upstream to https://github.com/Chatterino/chatterino2/commit/f892a2df8b3fab0027d2cd1dfd357d8e23b3b140