Fix `rake install` on M1 macs
Fix `rake install` on M1 macs

With the stricter code-signing requirements on M1 macs, `cp`ing the
binary exposes a bug in Apple code-signing where trying to execute the
resulting binary immediately exits with "Killed: 9"

By rm-ing then cp-ing, the destination file gets a new inode number and
avoids this problem.

https://developer.apple.com/documentation/security/updating_mac_software

mroth/scmpuff,mroth/scmpuff,mroth/scmpuff