This fixes compiling with clang on msys2. I believe you saved these files as UTF16 once or something and these byte order marks were added by an editor.
The PR leads to the line "// The MIT License (MIT)" to no longer be present in the single-header sol.hpp at 3 occasions, but I think they were there by mistake anyway and should've been stripped by the python script, but didn't, because of the BOM. So this actually fixes that as well.