make it build with libgit 1.8.2 #1587

Job	Run time
stylecheck	18s
build-debug	14m 55s
build-arch (all)	15m 57s
build (ubuntu:focal, g++, gcc, all)	14m 38s
build-arch (horizon.so)	4m 49s
build-opensuse (all)	13m 52s
build (ubuntu:focal, g++, gcc, horizon.so)	5m 2s
build-pr-review	3m 45s
build-opensuse (horizon.so)	4m 39s
build (ubuntu:jammy, g++, gcc, all)	13m 15s
build (ubuntu:jammy, g++, gcc, horizon.so)	4m 13s
build (ubuntu:noble, g++, gcc, all)	15m 14s
build (ubuntu:noble, g++, gcc, horizon.so)	4m 43s
build (debian:bullseye, g++, gcc, all)	12m 58s
build (debian:bullseye, g++, gcc, horizon.so)	4m 35s
build (debian:bookworm, clang, clang, all)	13m 36s
build (debian:bookworm, clang, clang, horizon.so)	4m 21s
build (debian:bookworm, g++, gcc, all)	15m 8s
build (debian:bookworm, g++, gcc, horizon.so)	4m 57s
	2h 50m 55s

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