add OpenHarmony (OHOS) target support#2954
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On OpenHarmony the user/process model is sandbox-based. libgit2's owner validation (GIT_OPT_SET_OWNER_VALIDATION) compares file UID with process EUID, which is not applicable and causes spurious "not owned by current user" errors (code=Owner -36). This disables owner validation on all OHOS targets (cfg(target_env = "ohos"): aarch64/armv7/x86_64) via a std::sync::Once in the repository opening entry points. Also adds cross-compilation instructions to CONTRIBUTING.md.
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On OpenHarmony the user/process model is sandbox-based. libgit2's owner validation (
GIT_OPT_SET_OWNER_VALIDATION) compares file UID with process EUID, which is not applicable and causes spurious "not owned by current user" errors (code=Owner -36).Changes
cfg(target_env = "ohos")) in both repository-opening entry pointsstd::sync::Onceto ensure the init runs exactly onceCONTRIBUTING.mdAffected targets
All OHOS targets share
target_env = "ohos":aarch64,armv7,x86_64