Bug#956729: asciidoc-base: add xsltproc to Depends

[merkys]

Hi Joseph,

On 2020-04-26 06:44, Joseph H. wrote:
> Anyway, I'll add the dependency tomorrow but note that you will also
> need to add --no-xmllint to avoid errors.

I just saw you have added xsltproc to the dependencies. Thanks a lot!

Best,
Andrius