testing/mstflint: new aport
Package Mellanox Firmware Tools (mstflint) for Alpine Linux: https://github.com/Mellanox/mstflint
musl patch from: https://github.com/Mellanox/mstflint/issues/582
Only tested on x86_64
as that's the only platform I have with PCIe slots to accept the Mellanox network adapter.