bug#69290: declare-function doesn't work when combined with --eval and -batch

[Konstantin Kharlamov]

Stumbled upon that while trying to improve CI in Evil mode. Enabling 
byte-compilation
causes warnings about `undo-redo` undeclared on older Emacs'es, so tried to work
around that with `declare-function`. Turns out it doesn't work.


# Steps to reproduce (in terms of terminal commands)

    λ cat test.el
    ;;; -*- lexical-binding: t -*-
    (hello)
    λ emacs -batch --eval '(declare-function hello nil)' -f batch-byte-compile 
test.el

    In end of data:
    test.el:2:2: Warning: the function ‘hello’ is not known to be defined.

## Expected

There's no warning

## Actual

There's a warning about undeclared function which is declared

# Additional information

Versions tested:

* commit d4d5830f8a0 built 3 weeks ago from master.
* 27.1, 26.3, 25.3