Initializes a git_diff_format_email_options with default values. Equivalent
to creating an instance with GIT_DIFF_FORMAT_EMAIL_OPTIONS_INIT.
@param opts The git_blame_options struct to initialize.
@param version The struct version; pass GIT_DIFF_FORMAT_EMAIL_OPTIONS_VERSION.
@return Zero on success; -1 on failure.
Initialize git_diff_format_email_options structure
Initializes a git_diff_format_email_options with default values. Equivalent to creating an instance with GIT_DIFF_FORMAT_EMAIL_OPTIONS_INIT.
@param opts The git_blame_options struct to initialize. @param version The struct version; pass GIT_DIFF_FORMAT_EMAIL_OPTIONS_VERSION. @return Zero on success; -1 on failure.