[Rpm-maint] [rpm-software-management/rpm] RFE Please add a verb to inhibit macro expansion (#569)

[nim-nim]

So I have a versy large shell macro, inside an `%{expand}` because it’s full of rpm variables that need interpetation, and I’m sick of the `\` game.

Among lots of other things, this macro needs to generale a `%license <somefile>` in file lists.

And of course that won't work because rpm will try to replace the `%license` tag with the content of the package `%{license}` variable.

My current hack is to do
```sh
while read -r -d $'\\n' f ; do
 (echo -n "%" ; echo "license '${f}'")             >> "%{currenfilelist}"
done <<< ${licensefiles}
```

But it is quite hackish and ugly. An unexpand verb would be much cleaner, and useful elsewhere besides.

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