Fix cross compilation issue (#437)

R/xml_parse.R

@@ -41,7 +41,7 @@
 #' @param verbose When reading from a slow connection, this prints some
 #'    output on every iteration so you know its working.
 #' @param options Set parsing options for the libxml2 parser. Zero or more of
-#' \Sexpr[results=rd]{xml2:::describe_options(xml2:::xml_parse_options())}
+#' \Sexpr[results=rd, stage=build]{xml2:::describe_options(xml2:::xml_parse_options())}
 #' @return An XML document. HTML is normalised to valid XML - this may not
 #'   be exactly the same transformation performed by the browser, but it's
 #'   a reasonable approximation.

R/xml_write.R

@@ -11,7 +11,7 @@
 #' encoding is \sQuote{UTF-8}. Available encodings are specified at
 #' <http://xmlsoft.org/html/libxml-encoding.html#xmlCharEncoding>.
 #' @param options default: \sQuote{format}. Zero or more of
-#' \Sexpr[results=rd]{xml2:::describe_options(xml2:::xml_save_options())}
+#' \Sexpr[results=rd, stage=build]{xml2:::describe_options(xml2:::xml_save_options())}
 #' @param ... additional arguments passed to methods.
 #' @export
 #' @examples