Bug#484740: some cross references don't work as info search files without .info extension

Control: retitle -1 info: buggy resolution of cross-references (does not ignore non-info files that are in the way)
Control: tags -1 upstream - wontfix
Control: forwarded -1 https://lists.gnu.org/archive/html/bug-texinfo/2026-02/msg00107.html

As I've said in the upstream bug, for a quick test just using the
files from texinfo:

disset:~> cp /usr/share/info/info.info.gz .
disset:~> touch texinfo
disset:~> info ./info

then in "1.7 Following Cross-References", there is a cross-reference
"*Note Overview of Texinfo: (texinfo)Top". Trying to follow it fails.

(Without the "texinfo" file in the current directory, everything is
fine.)