message: guix: Update hint messages to mention guix-clean
diff: @@ -103,6 +103,14 @@ ERR: Build directories for this commit already exist for the following platform
  Aborting...
  +Hint: To blow everything away, you may want to use:
  +
  + $ ./contrib/guix/guix-clean
  +
  +Specifically, this will remove all files without an entry in the index,
  +excluding the SDK directory, the depends download cache, the depends built
  +packages cache, the garbage collector roots for Guix environments, and the
  +output directory.
  EOF
  for host in $hosts_distsrc_exists; do
  echo " ${host} '$(distsrc_for_host "$host")'"
  @@ -277,15 +285,16 @@ outdir_for_host() {
  int_trap() {
  cat << EOF
  ** INT received while building ${1}, you may want to clean up the relevant
  - output, deploy, and distsrc-* directories before rebuilding
  + work directories (e.g. distsrc-*) before rebuilding
  Hint: To blow everything away, you may want to use:
  - $ git clean -xdff --exclude='/depends/SDKs/*'
  + $ ./contrib/guix/guix-clean
  Specifically, this will remove all files without an entry in the index,
  -excluding the SDK directory. Practically speaking, this means that all ignored
  -and untracked files and directories will be wiped, allowing you to start anew.
  +excluding the SDK directory, the depends download cache, the depends built
  +packages cache, the garbage collector roots for Guix environments, and the
  +output directory.
  EOF
  }
  