releng: Add usbmuxd to list of packages

configs/releng/packages.x86_64:
Add usbmuxd to list of packages, so that users have the option to use iOS devices out-of-the-box for data connection
during installation.

Fixes #99
3 jobs for master in 36 minutes and 49 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Lint
passed shellcheck #17186

00:00:19

 
  Build
passed build:secure: [baseline] #17187
secure

00:16:37

passed build:secure: [releng] #17188
secure

00:36:29