mkosi

repart: Support specifying multiple directories to ExcludeFiles= #957

Job	Run time
ci (arch, rolling, 0, -O2 -D_FORTIFY_SOURCE=3, no)	51m 8s
ci (centos, 10, 0, -Og, yes)	48m 31s
ci (centos, 9, 0, -Og, yes)	55m 42s
ci (debian, testing, 0, -Og, no)	46m 37s
ci (fedora, 40, 0, -Og, yes)	52m 1s
ci (fedora, rawhide, address,undefined, 1, -Og, yes)	1h 19m 42s
ci (opensuse, tumbleweed, 0, -Og, no)	50m 44s
ci (ubuntu, noble, 0, -Og, no)	49m 53s
	7h 14m 18s

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