bug#48123: 28.0.50; emacs-26.1-147099-gab7a61e0ef fails to build

[Eli Zaretskii]

> Date: Fri, 30 Apr 2021 10:19:18 -0400 (CLT)
> From: Horst von Brand <vonbrand@inf.utfsm.cl>
> 
> I grabbed the latest git version, did a `make clean`. The configuration is as 
> stated below for this (older) version. Then `make` fails:
> ```
> make[2]: Entering directory '/home/vonbrand/tmp/emacs/lisp'
>   ELC      textmodes/makeinfo.elc
> 
> In toplevel form:
> textmodes/makeinfo.el:71:1: Error: Cannot open load file: No such file or 
> directory, texinfo-loaddefs
> make[2]: *** [Makefile:301: textmodes/makeinfo.elc] Error 1
> ```

Either "make bootstrap" or "make -C lisp autoloads-force", then try
again.