Wireguard: segmentation fault on rPi

[Jason A. Donenfeld]

pi at raspberrypizero:~ $ readelf -a WireGuard/src/tools/wg | grep Tag_CPU_name
  Tag_CPU_name: "6"
pi at raspberrypizero:~ $ readelf -a /usr/bin/wg | grep Tag_CPU_name
  Tag_CPU_name: "7-A"

Looks like the Debian repo supplies ARMv7a binaries, whereas the
raspizero is ARMv6.