I created below script to build turbo-jpeg. The configure script automatically enabled NEON support after checking ARM environment. Anyone can use this script by changing variables like NDK, ARCH, PLATFORM etc.
This script will not work without some editing. There may be other ways to compile successfully but i was getting SIZE_MAX undefined error so i simply added #include
Below is the log file dumped after running this script. The resulting binaries can be downloaded from https://github.com/bindeshkumarsingh/android-native-libs/blob/master/libjpeg-turbo-1.5.1_Android.7z.
I haven't used this build for making a libjpeg client app. I expect it will work.