Fix build problems when including jconfig.h
The jconfig.h is placed at /usr/include/${DEB_HOST_MULTIARCH} instead of placing it at /usr/include, the only folder defined in the includedir statement in the .pc file. This breaks some builds, like libheif examples.
This patch fixes this by creating a soft link of the file. This preserves the original file for that code that expects it there, while, at the same time, makes it available where it is really required.
Fix https://bugs.launchpad.net/ubuntu/+source/libjpeg-turbo/+bug/2042483