Revert "img: Updating to syslinux 6.03-pre12"
Revert "img: Updating to syslinux 6.03-pre12"

This reverts commit 5c2452ec777d96de3604be6107b6caf25fd9851b.
That broke the booting...

lebauce/edeploy,enovance/edeploy,redhat-cip/edeploy,redhat-cip/edeploy,enovance/edeploy,enovance/edeploy,lebauce/edeploy,redhat-cip/edeploy,lebauce/edeploy,lebauce/edeploy,redhat-cip/edeploy,enovance/edeploy