There is an updated pull request by q66 against master on the void-packages repository

https://github.com/q66/void-packages gnome338
https://github.com/void-linux/void-packages/pull/24260

gnome 3.38
This should now be more or less ready. Tested on `aarch64` and on `ppc64le-musl`. Several "unstable" versions were used, since 3.38 shipped with them (e.g. `gnome-online-accounts`, `gnome-contacts` and the `gnome-flashback` components), shouldn't be a practical problem and we can update them later once tagged.

# TODO

- [x] clean it up
- [x] better testing, make sure testsuite passes
- [x] import the useful bits from #21382, or rebase if it gets merged
- [ ] make sure crossbuilds work
- [x] test on more platforms
- [x] fix the metapackages (they haven't been touched, possibly in https://github.com/void-linux/void-packages/pull/22936)
- ~~drop the `vala` option in the rest of the packages~~ probably gonna do that once this PR is merged

# Stable updates

- [x] yelp-xsl -> 3.38.0
- [x] yelp-tools -> 3.38.0
- [x] yelp -> 3.38.0
- [x] vala -> 0.50.0
- [x] valadoc -> 0.50.0 
- [x] valabind -> (revbump) 
- [x] devhelp -> 3.38.0
- [x] gdl -> 3.34.0
- [x] libsoup -> 2.72.0
- [x] grilo -> 0.3.13
- [x] grilo-plugins -> 0.3.12
- [x] gtksourceview4 -> 4.8.0
- [x] tepl -> 5.0.0
- [x] glade3 -> 3.38.0
- [x] libhandy -> (revbump)
- [x] libhandy1 -> 1.0.0
- [x] libxfce4ui -> (revbump)
- [x] libdazzle -> 3.38.0
- [x] anjuta -> (revbump)
- [x] sysprof -> 3.38.0
- [x] tracker -> 2.3.6
- [x] tracker-miners -> 2.3.5
- [x] tracker3 -> 3.0.0 **(new)**
- [x] tracker3-miners -> 3.0.0 **(new)**
- [x] bijiben -> 3.36.3
- [x] graphene -> 1.10.2
- [x] amtk -> 5.2.0
- [x] io.elementary.code -> (revbump)
- [x] phodav -> 2.5
- [x] gsettings-desktop-schemas -> 3.38.0
- [x] glib-networking -> 2.66.0
- [x] at-spi2-core -> 2.38.0
- [x] at-spi2-atk -> 2.38.0
- [x] libgweather -> 3.36.1
- [x] gnome-menus -> 3.36.0
- [x] gnome-desktop -> 3.38.0
- [x] gnome-settings-daemon -> 3.38.0
- [x] mutter -> 3.38.0
- [x] cheese -> 3.38.0
- [x] evolution-data-server -> 3.38.0
- [x] folks -> 0.14.0
- [x] gnome-online-accounts -> 3.37.90
- [x] gvfs -> 1.46.0
- [x] gnome-control-center -> 3.38.0
- [x] dconf-editor -> 3.38.0
- [x] gjs -> 1.66.0
- [x] gnome-shell -> 3.38.0
- [x] gnome-shell-extensions -> 3.38.0
- [x] gdm -> 3.38.0
- [x] gnome-session -> 3.38.0
- [x] gnome-initial-setup -> 3.38.0
- [x] xdg-desktop-portal-gtk -> 1.8.0
- [x] nautilus -> 3.38.0
- [x] gnome-maps -> 3.38.0
- [x] evolution -> 3.38.0
- [x] evolution-ews -> 3.38.0
- [x] python3-atspi -> 2.38.0
- [x] python-atspi -> 2.38.0
- [x] orca -> 3.38.0
- [x] gnome-weather -> (revbump)
- [x] vte3 -> 0.62.0
- [x] gnome-terminal -> 3.38.0
- [x] gnome-getting-started-docs -> 3.36.2
- [x] gnome-user-docs -> 3.38.0
- [x] gnome-epub-thumbnailer -> 1.6
- [x] gnome-books -> (revbump)
- [x] gnome-characters -> (revbump)
- [x] gnome-documents -> (revbump)
- [x] gnome-font-viewer -> (revbump)
- [x] totem -> 3.38.0
- [x] gnome-screensaver -> (revbump + build fix)
- [x] gnome-clocks -> 3.38.0
- [x] epiphany -> 3.38.0
- [x] gnome-contacts -> 3.37.2
- [x] gnome-photos -> 3.37.91.1
- [x] eog -> 3.38.0
- [x] evince -> 3.38.0
- [x] file-roller -> 3.38.0
- [x] gnome-calendar -> 3.38.0
- [x] gnome-music -> 3.38.0
- [x] gedit -> 3.38.0
- [x] gedit-plugins -> 3.38.0
- [x] gnome-latex -> 3.38.0
- [x] baobab -> 3.38.0
- [x] gnome-boxes -> 3.38.0
- [x] gnome-calculator -> 3.38.0
- [x] gnome-disk-utility -> 3.38.0
- [x] gnome-screenshot -> 3.38.0
- [x] gnome-system-monitor -> 3.38.0
- [x] adwaita-icon-theme -> 3.38.0
- [x] gnome-backgrounds -> 3.38.0
- [x] simple-scan -> 3.38.0
- [x] rygel -> 0.40.0
- [x] gnome-builder -> 3.38.0
- [x] retro-gtk -> 1.0.0
- [x] gnome-games -> 3.38.0
- [x] gnome-panel -> 3.37.1
- [x] metacity -> 3.37.1
- [x] gnome-flashback -> 3.37.3
- [x] budgie-desktop -> (rebuild)

## Merged

- [x] libsigc++3 -> 3.0.3 (new)
- [x] mm-common -> 1.0.1
- [x] glibmm -> 2.64.2
- [x] pangomm -> 2.42.1
- [x] libnotify -> 0.7.9
- [x] atk -> 2.36.0
- [x] gtk+3 -> 3.24.22
- [x] libportal -> 0.3 (new)
- [x] cogl -> 1.22.28
- [x] geocode-glib -> 3.26.2
- [x] gfbgraph -> 0.2.4
- [x] libgsf -> 1.14.47
- [x] libsecret -> 0.20.3
- [x] libchamplain -> 0.12.20
- [x] gom -> 0.4
- [x] gssdp -> 1.2.3
- [x] gtk-vnc -> 1.0.0 (drops unused gtk2 support)
- [x] gupnp -> 1.2.4
- [x] gnome-video-effects -> 0.5.0
- [x] glib -> 2.66.0
- [x] webkit2gtk -> 2.30.0
- [x] mozjs78 -> 78.2.0 (new)

## No updates

- polari (no newer stable version)
- gtk4 (no stable version yet)

A patch file from https://github.com/void-linux/void-packages/pull/24260.patch is attached