Add support for legacy flat signatures with recid instead of normalized v.
Add support for legacy flat signatures with recid instead of normalized v.

ethers-io/ethers.js,ethers-io/ethers.js,ethers-io/ethers.js,ethers-io/ethers.js,ethers-io/ethers.js,ethers-io/ethers.js,ethers-io/ethers.js