[ISSUE] [RFC]: vdummy shortcut for transitional packages

[paper42 <paper42@users.noreply.github.com>]

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New issue by paper42 on void-packages repository

https://github.com/void-linux/void-packages/issues/39272

Description:
Every transitional package has at least these 3 common variables:
* `build_style=meta` - otherwise the build would fail because of an empty package
* `depends=...` - usually `${sourcepkg}>=${version}_${revision}`, but often `${version}_${revision}` is left out or `${sourcepkg}` is replaced by something else, for example `${sourcepkg}-devel` 
* `short_desc+=" transitional package"` or an equivalent, many versions currently exist in packages

a few examples:
```
antimicro_package() {                                                           
	build_style=meta                                                            
	depends="${sourcepkg}"                                                      
	short_desc+=" - transitional dummy package"                                 
}    
```

```
Gifsicle_package() {
	depends="gifsicle"
	short_desc+=" (transitional dummy package)"
	build_style=meta
}
```

This is a proposal for a vdummy function that fills these variables for the packager, for example:

```
antimicro_package() {
	vdummy ${sourcepkg}
}
```

`vdummy` should take one argument - the package name and use it in `$depends` - `depends="$1>=${version}_${revision}"`. `vdummy` will also unify `$short_desc` for transitional packages, I would propose to use the ` - (transitional dummy package)` style.