TEMPORARY: fix gcc-4.8 warnings with latest patch set #509

Job	Run time
build-current (alpine, amd64)	1m 3s
build-current (alpine, ppc64le)	8m 18s
build-current (alpine, aarch64)	9m 2s
build-current (alpine, 386)	1m 14s
build-current (alpine, s390x)	8m 28s
build-current (debian-sid, arm/v7)	8m 43s
build-current (alpine, arm/v7)	8m 33s
build-current (debian-sid, 386)	1m 4s
build-current (debian-sid, amd64)	1m 2s
build-current (debian-sid, aarch64)	10m 47s
build-current (debian-sid, ppc64le)	9m 18s
build-current (fedora-rawhide, s390x)	8m 31s
build-current (fedora-rawhide, aarch64)	35m 23s
build-current (opensuse-tumbleweed, amd64)	51s
build-current (opensuse-tumbleweed, s390x)	8m 40s
build-current (opensuse-tumbleweed, aarch64)	36m 26s
build-current (opensuse-tumbleweed, arm/v7)	9m 29s
build-current (fedora-rawhide, amd64)	57s
build-current (opensuse-tumbleweed, ppc64le)	9m 25s
build-current (fedora-rawhide, ppc64le)	8m 59s
build-current (opensuse-tumbleweed, 386)	1m 8s
build-current (debian-sid, s390x)	7m 54s
	3h 15m 15s

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