Revert "- updated to 9a"

This reverts commit 1080b8b0d97387fce6cf7396b7a0fb0ee38796dc.
Revert "- updated to 9 (note: new soname; libjpeg 8X left on libjpeg-8 branch)"

This reverts commit 57a92107f9272dcaec4e19f5b9cb86d6bd0eeaa5.
- libjpeg 8 series as libjpeg8