build(deps): vendor lpeg

Problem: LPeg is hosted on a single unreliable external hoster, forcing
is to mirror it in neovim/deps, which adds maintenance friction. Also,
we have already vendored the Lua `re.lua` module.

Solution: Vendor all of LPeg v1.1.0; as development is not very active
anymore, this should not add much overhead (and allow us to simplify in
particular the Zig build scripts).

Note: LPeg defines a `luaL_newlib` macro for Lua 5.1, which conflicts
with LuaJIT's extension. This requires inlining the macro defined in
`lptypes.h` and used in `lptree.c`; see README.md for the patch.

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