graphics/libjxl: unbreak JPEG=off after 115fc1237eeb
Error: Missing: bin/cjpeg_hdr
https://github.com/libjxl/libjxl/commit/759a29f9e6e0
PR: 271124
Submitted by: fsbruva@yahoo.com
(cherry picked from commit 0bafdac68158d54d6aa6a06c96b566809066d770)