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This PR is a companion of https://github.com/gitgitgadget/git/pull/2103. On Windows, `maintenance_task_geometric_repack()` opens pack index files via `pack_geometry_init()` (which `mmap()`s the `.idx` files), then spawns `git repack` as a child process without setting `child.odb_to_close`. The parent's `mmap()`s prevent the child from deleting old `.idx` files. On Windows 10 builds before the POSIX delete semantics change (between Build 17134.1304 and 18363.657, see https://stackoverflow.com/a/60512798), this results in `Unlink of file '.git/objects/pack/pack-<hash>.idx' failed. Should I try again?` during fetch-triggered auto-maintenance with the geometric strategy. The fix adds the missing `child.odb_to_close = the_repository->objects` line, matching all other maintenance tasks. The first commit introduces a `GIT_TEST_LEGACY_DELETE` environment variable to simulate legacy (pre-POSIX) delete semantics on modern Windows, so the regression test can verify the fix even on Windows 11. This fixes https://github.com/git-for-windows/git/issues/6210. Tested-by: Patryk Miś <foss@patrykmis.com>