Qt 5.15.2 compile errors w/ g++ 11

I've created patches to 5.15.2 that allows it to compile with g++ 11.2 on Ubuntu 21.10.

I couldn't figure out how to create a single patch with submodules (I ended up creating a single patch file in each submodule).  Unfortunately, for a number of the patches I used the same description so the filenames were duplicated.  I pre-pended the directory (submodule) to the patches to make them unique.

 Only one change is "wrong" where I've #if 0'ed out a template that doesn't compile (the correct fix wasn't obvious to me).

Note that I didn't fix all compiler warnings as there are a large number of them.