Constant libgit2_sys::GIT_ERROR_FETCHHEAD

pub const GIT_ERROR_FETCHHEAD: git_error_t = 0 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1
    + 1 + 1; // 21u32