Honor Single Unix Specification (SUS) by allowing multiple arguments to be grouped behind single `-`

Hello!

As per SUS Utility syntax guideline 5, command-line utility should allow multiple arguments to be grouped behind single - delimiter.

I have yet to come across the *nix utility which doesn't follow this convention. Can we please honor the Single Unix Specification?

$ terminal/xfce4-terminal -Hx ls
xfce4-terminal: Unknown option "-Hx"
$ terminal/xfce4-terminal -H -x ls
$ terminal/xfce4-terminal --version
xfce4-terminal 0.8.10git-aa756372 (Xfce 4.16)
...
$