Possible REG: Wasm changes in qunicodetables will be lost

With Emscripten, we need a special 0-length bitfield in the unicode tables to work around a compiler bug.

However, it looks like this was either added directly in the generated files and some buggy code was added to the generator and never run, or the code in the generator has been messed up by a merge later on.

Regardless, the code in the generator does not work, so when the generated files are updated, the workaround will disappear.

Lets check if the workaround is still needed, and if it is, add the code to the generator.