[vim/vim] Fix link error with gtk2. (PR #20857)

The function `gtk_widget_get_scale_factor()` doesn't exist for gtk2.

```
ld: objects/gui_gtk_x11.o: in function `gui_mch_init': gui_gtk_x11.c:(.text+0x33f1): undefined reference to `gtk_widget_get_scale_factor' link.sh: Linking failed
*** Error code 1

Stop.
```
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20857

-- Commit Summary --

  * Fix link error with gtk2.

-- File Changes --

    M src/gui_gtk_x11.c (2)

-- Patch Links --

https://github.com/vim/vim/pull/20857.patch
https://github.com/vim/vim/pull/20857.diff

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