work around libgit2 1.8 #1544

Job	Run time
stylecheck	21s
build-opensuse (all)	13m 28s
build (ubuntu:focal, g++, gcc, all)	14m 59s
build-opensuse (horizon.so)	4m 41s
build-pr-review	3m 37s
build (ubuntu:focal, g++, gcc, horizon.so)	4m 51s
build-arch (all)	15m 25s
build-arch (horizon.so)	4m 37s
build (ubuntu:jammy, g++, gcc, all)	12m 53s
build (ubuntu:jammy, g++, gcc, horizon.so)	4m 2s
build-debug	14m 39s
build (ubuntu:lunar, g++, gcc, all)	14m 44s
build (ubuntu:lunar, g++, gcc, horizon.so)	4m 33s
build (debian:bullseye, g++, gcc, all)	12m 56s
build (debian:bullseye, g++, gcc, horizon.so)	4m 15s
build (debian:bookworm, clang, clang, all)	13m 34s
build (debian:bookworm, clang, clang, horizon.so)	4m 25s
build (debian:bookworm, g++, gcc, all)	14m 52s
build (debian:bookworm, g++, gcc, horizon.so)	4m 44s
	2h 47m 36s

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