There is an updated pull request by motorto against master on the void-packages repository

https://github.com/motorto/void-packages autoconf-2.71
https://github.com/void-linux/void-packages/pull/38412

autoconf: update to 2.71.
[ci skip]

#### Testing the changes
- I tested the changes in this PR: **YES**

#### Local build testing
- I built this PR locally for my native architecture, x86_64-glibc
- I built this PR locally for these architectures (if supported. mark crossbuilds):
  - armv6l

I have also update autoconf-archive in this pr.

Because this is a critical package I will make sure that all package that depends on autoconf and automake still compile.

There was some changes that might need to add [gtk-doc on hostmakedepends](https://www.mail-archive.com/bug-autoconf@gnu.org/msg04872.html). Separate PRs for the packages will be created and I will reference here.

Compiled all the packages that depend on autoconf and automake `grep -ri autconf` (Yes, I know it has some false negatives).  Thanks @paper42  for that

Packages failing that were failing already (will not fix)

- MEGAcmd
- ctags (patch fails to apply ...) #38597 
- davfs2
- gamin (patch fails to apply ...) 
- gnome-latex
- libcryptui
- libtar (patchs fail to apply)
- mod_wsgi
- pcsxr
- pdsh ( tests fail)
- pgadmin3
- portaudio
- tcpflow
- transcode
- xnec2c
- kea -  fails with sphinx.errors.SphinxWarning: Invalid configuration value found: 'language = None'. Update your configuration to a valid langauge code. Falling back to 'en' (English). 
- gsoap (fail to fetch needs to be updated)


Packages that the tests were failling already ~(added make_check=no)~

- clutter
- rest
- watchman (test fail)

Packages fixed on other PRS:

- bluebird-themes #38543 
- tpm2-tss #38567 
- lksctp-tools #38581 

Packages fixed in this PR:

- hunspell
- libsasl - remove patch for old autoconf
- lxsession
- ltrace

Packages that need to tested by someone else (don't build on x86_64{musl,glibc})

- librtas
- libump-git
- libvpd
- lsvpd
- powerpc-utils
- sun7i-kernel
- yaboot


Packages that I still need to confirm if they fail because of this update or if they already failed:

- [X] firefox - I am not trying to compile this one on my system sorry :)
- [ ] geany - need help here upstream [changed to meson but didn;t release it yet](https://github.com/geany/geany/issues/2771)
- [ ] gloobus-preview
- [ ] hplip
- [ ] iverilog
- [ ] libsrtp
- [X] mbox - compiles fine on my system
- [x] mozjs78 - compiles fine on my system
- [x] mozjs91 -  compiles fine on my system
- [ ] openjdk7-bootstrap
- [ ] openldap
- [X] opensc -  compiles fine on my system
- [ ] pilot-link
- [ ] rng-tools
- [ ] seahorse-nautilus - need help with this one
- [x] thunderbird
- [ ] tigervnc
- [x] tracebox - compiles fine on my system
- [x] vlc - compiles fine on my system
- [X] xmoto - compiles fine on my system



A patch file from https://github.com/void-linux/void-packages/pull/38412.patch is attached