Add needs for arch-specific autopkgtest jobs and fix disable rules
Link i386, armel, armhf, and arm64 autopkgtest jobs to their respective
build jobs so that the correct *.changes and binaries are available
during testing.
It also fixes the rules for armhf and arm64 to use the right disable flags.
Closes: #476 (closed)
Edited by Aquila Macedo