use pdf-tools in Emacs.

[Hongyi Zhao]

Hi here,

I try to use pdf-tools [1] in Emacs, but meet the following problem:

```shell
$ git log -1
commit 7ff6293a25baaae65651b3e1c54b61208279a7ef (HEAD -> master,
origin/master, origin/HEAD)
Author: Davide Masserut <dm@mssdvd.com>
Date:   Sun Apr 2 21:48:25 2023 +0200

    Ensure pixel-scroll-precision-mode deactivation

    Setting `pixel-scroll-precision-mode` to nil is not sufficient to disable
    the mode locally.

    Updates: #124

$ make -s
Using Emacs 30.0
make: cask: No such file or directory
make: *** [Makefile:49: .cask/30.0] Error 127
```

Then I run the steps here [2], but see the following chaos in pdf
buffer, as shown in the attached file.

How to fix it?

[1] https://github.com/vedang/pdf-tools
[2] https://www.emacswiki.org/emacs/init-pdf-tools.el
-- 
Assoc. Prof. Hongsheng Zhao <hongyi.zhao@gmail.com>
Theory and Simulation of Materials
Hebei Vocational University of Technology and Engineering
No. 473, Quannan West Street, Xindu District, Xingtai, Hebei province

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