bug#52554: 28.0.90; mm-inline-media-tests customization breaks .emacs reading

[Eli Zaretskii]

> From: Robert Pluim <rpluim@gmail.com>
> Date: Thu, 16 Dec 2021 16:18:13 +0100
> 
> That has an embedded 'NUL' just before the \302 (Iʼve encoded it),
> which causes 'buffer-file-coding-system' to be incorrect
> ('no-conversion in this case) so any non-ascii character causes a read
> error:
> 
> $ HOME=/tmp emacs --debug-init
> 
> Debugger entered--Lisp error: (invalid-read-syntax "?" 1 0)
>   read(#<buffer  *load*>)
>   eval-buffer(#<buffer  *load*> nil "/tmp/.emacs" nil t)  ; Reading at buffer 
> position 573
>   load-with-code-conversion("/tmp/.emacs" "/tmp/.emacs" t t)
>   load("~/.emacs" noerror nomessage)

Perhaps we should bind inhibit-null-byte-detection to a non-nil value
while loading the init file?