Index: icon-functions.php
===================================================================
--- icon-functions.php	(revision 74240)
+++ icon-functions.php	(working copy)
@@ -16,7 +16,7 @@
 
 	// If it exists, include it.
 	if ( file_exists( $svg_icons ) ) {
-		require_once( $svg_icons );
+		echo file_get_contents( $svg_icons );
 	}
 }
 add_action( 'wp_footer', 'twentyseventeen_include_svg_icons', 9999 );