[CM] Strange display behavior

[bil at ccrma.Stanford.EDU]

> (display `(foo . ,(string-append "hello " "there")))

Thanks.  This is the other append in g_quasiquote_1 which
I meant to check, but got sidetracked -- ca line 67688.
I'll put up the fixed version tomorrow.  In s7 it
displays as (foo . "hello there").