CI: Drop ppc64le and s390x from multiarch tests #135

Job	Run time
Arch Linux	1m 52s
Get Fedora Releases	9s
Mageia 8	2m 6s
OpenMandriva Cooker	3m 1s
openSUSE Tumbleweed	2m 27s
Installed RPM Tests (Devel Fedora) (x86_64, 40)	4m 10s
Unit Tests (Stable Fedora) (38)	3m 19s
Unit Tests (Devel Fedora) (40)	3m 9s
Unit Tests (Stable Fedora) (39)	3m 31s
Installed RPM Tests (Stable Fedora) (x86_64, 38)	3m 54s
Installed RPM Tests (Stable Fedora) (x86_64, 39)	4m 43s
	32m 21s

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