bff6405afc
The 7.7k-line qemu-wasm patch was really a fork, so vendor it as a submodule (pinned at the xteink QEMU fork) and build it directly. Removes the clone/commit-check/patch/reset machinery, the redundant web-dev/patch targets, and 0002-qemu-wasm.patch. Editing third_party/qemu now recompiles incrementally via plain `make web`. Native build keeps 0001-xteink-machine.patch.