Function libgit2_sys::git_cred_ssh_key_new

pub unsafe extern fn git_cred_ssh_key_new(out: *mut *mut git_cred,
                                          username: *const c_char,
                                          publickey: *const c_char,
                                          privatekey: *const c_char,
                                          passphrase: *const c_char)
                                          -> c_int