[Toybox] [PATCH] sh: pass "\" to the later app

[Rob Landley]

> On 6/12/23 19:40, Chet Ramey wrote:
>> I wish you were not so reluctant. Look at how many things you've discovered
>> that I decided were bugs based on our discussions.
>
> But since you asked, today's new question I wrestled with was

Where did the FF come from?

$ bash -c $'cat<<0\n\\' | hd
bash: line 1: warning: here-document at line 0 delimited by end-of-file (wanted `0')
00000000  5c ff 0a                                          |\..|
00000003

Rob