main/iproute2: upgrade to 5.11
Remove the two patches we applied previously as they no longer seem to be needed and no longer apply (i.e. builds fine without them and no install(1) usage error shows up in the build log).
Remove the two patches we applied previously as they no longer seem to be needed and no longer apply (i.e. builds fine without them and no install(1) usage error shows up in the build log).