Initializes a git_remote_callbacks with default values. Equivalent to
creating an instance with GIT_REMOTE_CALLBACKS_INIT.
@param opts the git_remote_callbacks struct to initialize
@param version_ Version of struct; pass GIT_REMOTE_CALLBACKS_VERSION
@return Zero on success; -1 on failure.
Initializes a git_remote_callbacks with default values. Equivalent to creating an instance with GIT_REMOTE_CALLBACKS_INIT.
@param opts the git_remote_callbacks struct to initialize @param version_ Version of struct; pass GIT_REMOTE_CALLBACKS_VERSION @return Zero on success; -1 on failure.