Sorry for the noise. 3.1.4 had a build system regression that made the
CMake package config files non-relocatable and broke the --prefix option
to cmake --install. If that isn't important to you, then feel free to
disregard. (There are no other differences relative to 3.1.4.)
Binaries, source tarball, and change log are here:
https://github.com/libjpeg-turbo/libjpeg-turbo/releases/tag/3.1.4.1