graphics/imv: Update to 5.0.1
- FreeImage backend was removed upstream; BMP and WebP support now come from the new NSBMP and WEBP options (on by default)
- Add new options: FF (farbfeld), JXL (on by default), NSBMP, WEBP
- NSGIF is no longer broken
- Disable the QOI backend (not ported)
- Drop ICU linking patch, fixed upstream (now uses icu-uc)
- Rename the sample config in post-install instead of patching meson.build
Changelog: https://git.sr.ht/~exec64/imv/tree/master/item/CHANGELOG
PR: 299377
MFH: 2026Q4
(cherry picked from commit a5c9087871ed544894206a5347be43d491fe1fc3)