Vendored snapshot of https://github.com/hadilq/type-nn at commit
73aff3c122d3412f3cd9dfcedc53eee4d4351436, plus one local change to
type_nn_graph.c: explicit tie-breakers in the two qsort comparators
(ekey_cmp: c, dst, src; cand_cmp: alone, listing order), so the order does not
depend on the libc. The same change is proposed upstream (PLAN.md). Plus
tnn_py.c/h (the stable Python ABI, chain and graph). Lives at
src/torch_type_nn/native/c so the wheel ships the sources as package data
once — do not also force-include them from csrc/.
