RPi 3B+ Raspbian / armv7l uname_arch_check failing

Similarly to https://github.com/client9/shlib/issues/11, got an issue with armv7l

```
pi@raspberrypi:~/traefik $ uname -a
Linux raspberrypi 5.10.63-v7+ #1488 SMP Thu Nov 18 16:14:44 GMT 2021 armv7l GNU/Linux

log_crit uname_arch_check 'armv7l' got converted to 'arm7' which is not a GOARCH value.  Please file bug report at https://github.com/client9/shlib
```