bug#22154: 25.0.50; emacsclient -c "breaks" 256-color display in server

[Eli Zaretskii]

> From: Eric Hanchrow <eric.hanchrow@gmail.com>
> Date: Sun, 13 Dec 2015 12:26:10 -0800
> Cc: 22154@debbugs.gnu.org
> 
>     You can run the command ‘server-start’ with M-x ser-s RET
>     terminal-init-xterm doin’ its thang.  (tty-color-alist) returns a
> list of length 256.
>     terminal-init-xterm is done.  (tty-color-alist) now returns a list
> of length 8.
>     When done with this frame, type C-x 5 0
> 
> So clearly: xterm.el initialization _is_ getting called for the client
> frame, and it _does_ modify tty-color-alist.

Right.  I guess we will have to make tty-defined-color-alist
terminal-specific, or something.  This will have to wait until after
25.1, sorry.