There's a merged pull request on the void-packages repository

curl: use mdocml instead of groff to build manual
https://github.com/void-linux/void-packages/pull/31376

Description:

Break circular dependencies:
```
elfutils > curl > groff > ghostscript
 ^                         v
glib < p11-kit < gnutls < cups
```
Technically, it's not necessary to bump revision, since diffoscope
reports same contents.

Fix: 10985815eb, (groff: obtain devpdf fonts from ghostscript, 2021-05-25)

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#### General
- [ ] This is a new package and it conforms to the [quality requirements](https://github.com/void-linux/void-packages/blob/master/Manual.md#quality-requirements)

#### Have the results of the proposed changes been tested?
- [x] I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
- [ ] I generally don't use the affected packages but briefly tested this PR

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