rust-hg-core: use correct type for libc hostname buffer
The type of libc::c_char is u8 on aarch64 rather than i8, which causes
the use of a specifically-typed constant to fail.
Differential Revision: https://phab.mercurial-scm.org/D12373
adding changesets
adding manifests
adding file changes
added 1 changesets with 4 changes to 4 files
new changesets d326ae2d01ee (1 drafts)
4 files updated, 0 files merged, 0 files removed, 0 files unresolved
adding changesets
adding manifests
adding file changes
added 1 changesets with 4 changes to 4 files
new changesets d326ae2d01ee (1 drafts)
4 files updated, 0 files merged, 0 files removed, 0 files unresolved