[Merge] lp:~khurshid-alam/hud/reupload-to-focal into lp:hud

[Khurshid Alam]

Khurshid Alam has proposed merging lp:~khurshid-alam/hud/reupload-to-focal into lp:hud.

Commit message:
* Fix python dependency

* Disable gtk-doc for now. It can be enabled later.

Gtkdoc-mktmpl was removed from gtk-doc >= 1.26. Instead it now, itself, provides GtkDocConfig.cmake module but doesn't say much about the migration other than https://developer.gnome.org/gtk-doc-manual/stable/cmake.html.en. So disable it until it is fixed. 

Fixes LP: #1866180


Requested reviews:
  Sebastien Bacher (seb128)
Related bugs:
  Bug #1866180 in hud (Ubuntu): "Re-Upload in to Focal"
  https://bugs.launchpad.net/ubuntu/+source/hud/+bug/1866180

For more details, see:
https://code.launchpad.net/~khurshid-alam/hud/reupload-to-focal/+merge/380283

Note I disabled the gtk-doc here. The migration doc specified here https://developer.gnome.org/gtk-doc-manual/stable/cmake.html.en didn't work and require more time to investigate. So considering the time constraint I think it is acceptable to do it here. This doesn't hamper the functionality any way. 

It will be fixed later. 
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