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

https://github.com/ericonr/void-packages gimp
https://github.com/void-linux/void-packages/pull/27511

gimp: put locale data in /usr/share/locale.
Their gettext version check tries to link _nl_msg_cat_cntr, which is
available only in GNU gettext. This breaks when using musl's built-in
gettext impl, and leads to DATADIRNAME=lib being set, which is then used
to set gimplocaledir to /usr/lib/locale.

A patch file from https://github.com/void-linux/void-packages/pull/27511.patch is attached