23.0.60; x-list-fonts returns font-entity instead of strings

[Yoshiaki Kasahara]

The docstring of x-list-fonts says that the return valus is a list
of strings, but actually it now returns a list of font-entity, which
is incompatible with create-fontset-from-ascii-font.

(create-fontset-from-ascii-font
        "-misc-fixed-medium-r-normal--14-*-*-*-*-*-iso8859-1" nil "misc_14")

Debugger entered--Lisp error: (wrong-type-argument char-or-string-p 
#<font-entity xft Misc Fixed nil iso8859-1 normal normal normal 14 nil 110 nil 
((:font-entity "/usr/local/lib/X11/fonts/misc/7x14-ISO8859-1.pcf.gz" . 0))>)

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