CI: drop s390x and ppc64le, add aarch64 #288

Job	Run time
Arch Linux	1m 52s
Get Fedora Releases	6s
openSUSE Tumbleweed	2m 7s
OpenMandriva Cooker	3m 24s
Mageia 8	2m 7s
Unit Tests (Devel Fedora) (40)	3m 4s
Installed RPM Tests (Devel Fedora) (x86_64, 40)	3m 34s
Unit Tests (Stable Fedora) (38)	3m 44s
Unit Tests (Stable Fedora) (39)	3m 25s
Installed RPM Tests (Stable Fedora) (x86_64, 38)	4m 29s
Installed RPM Tests (Stable Fedora) (x86_64, 39)	3m 52s
	31m 44s

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