* mingw-w64-cross-compiler-rt: update to 21.1.1 * mingw-w64-cross-clang: update to 21.1.1 * mingw-w64-cross-compiler-rt: makedepend on llvm now that it's split and not pulled in via clang * mingw-w64-cross-clang: depend on llvm, for tools like llvm-dlltool * mingw-w64-cross-compiler-rt: add third-party sources, for siphash/SipHash.h