Get rid of libwinpthread when switching tor to mingw-w64-clang
There is no need to ship libwinprthread when compiling tor
with mingw-w64-clang. See: #31584 (moved) for context.
Note this is strictly speaking a parent ticket for #29321 (moved). However, Trac thinks any child can only have one parent. So, here we are.
To upload designs, you'll need to enable LFS and have admin enable hashed storage. More information