Drop createrepo_c build deps #104

Job	Run time
base-images	16m 30s
lint	8s
app-images (nightly, pulp-minimal)	17m 50s
app-images (nightly, pulp)	33m 30s
app-images (nightly, galaxy-minimal)	12m 40s
app-images (nightly, galaxy)	14m 6s
app-images (stable, pulp-minimal)	13m 25s
app-images (stable, pulp)	28m 46s
app-images (stable, galaxy-minimal)	11m 3s
app-images (stable, galaxy)	12m 39s
	2h 40m 37s

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