Bug#991060: mlpost FTBFS with imagemagick with the #987504 change

[Santiago Vila <sanvila@debian.org>]

Hello.

I have made a NMU to fix this in *bullseye*.
(You probably received the Cc for the release.debian.org bug I filed).

The proposed diff which I sent in 2022-12 was not enough.
I had to do this as well:

 override_dh_auto_install:
 ifneq (,$(findstring libmlpost-ocaml-doc,$(shell dh_listpackages)))
-       $(MAKE) doc
+       $(MAKE) doc HOME=$(shell mktemp -d)
 endif

For some reason the writable HOME feature of debhelper 13 was not working,
but at least I could reuse most of the work by Dennis Filder.

Thanks.