CI: Drop ppc64le and s390x from multiarch tests #134

Job	Run time
Mageia 8	2m 5s
Arch Linux	1m 55s
Get Fedora Releases	6s
OpenMandriva Cooker	4m 2s
openSUSE Tumbleweed	4m 17s
Unit Tests (Devel Fedora) (40)	3m 34s
Unit Tests (Stable Fedora) (39)	3m 28s
Installed RPM Tests (Stable Fedora) (x86_64, 39)	3m 56s
Installed RPM Tests (Devel Fedora) (x86_64, 40)	4m 10s
Unit Tests (Stable Fedora) (38)	3m 22s
Installed RPM Tests (Stable Fedora) (x86_64, 38)	3m 30s
	34m 25s

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