bug#59334: 29.0.50; loading native-compiled init file sets user-init-file to .eln

[Eli Zaretskii]

> From: Juanma Barranquero <lekktu@gmail.com>
> Date: Fri, 18 Nov 2022 13:40:44 +0100
> Cc: akrl@sdf.org, 59334@debbugs.gnu.org
> 
> Hmm. I can use `string-equal-ignore-case', if you want, but the original code 
> was already checking for "el"
> case-sensitively.

Actually, forget about this.  It could mean complications with unibyte
file names at startup, so let's leave this alone.