[FR] Do not resolve relative "file" paths

[Ruijie Yu via "General discussions about Org-mode." <emacs-orgmode@gnu.org>]

Both Emacs and Org are on recent master commits.

Repro:

--8<---------------cut here---------------start------------->8---
$ cd $(mktemp -d)
$ mkdir 1
$ touch 2
$ emacs -L /org/lisp/ -Q 1/3.org
M-: emacs-repository-version RET
    "db7e95531ac36ae842787b6c5f2859d0642c78cc"
M-x org-version RET
    Org mode version 9.7-pre (release_9.6.1-321-g44e1cb @ /opt/src/emacs/packages/orgmode/main/lisp/)
C-c C-l file:../4 RET RET
    [[file:/tmp/tmp.ztrbRDDtKy/4]]
C-c C-l file:../2 RET RET
    [[file:/tmp/tmp.ztrbRDDtKy/2]]
--8<---------------cut here---------------end--------------->8---

Note that I showcased both ../4 and ../2 because it seems that the
referenced file does not need to exist.

I expect the links to be literally [[file:../4]] and [[file:../2]]
respectively.  This is helpful for me to reference other files
relatively (e.g., in a repository).

For example, since I am working on translating orgweb to zh_CN, I have
/zh_CN/index.org referencing /resources/img/xyz.svg, where after I do
`C-c C-l file:../resources/img/xyz.svg RET' inside /zh_CN/index.org, Org
resolves this link to an absolute path which is counterproductive and
does not work beyond my own computer.

--
Best,


RY