Reduce spurious diffs with upstream.

Bug: 9469682
Change-Id: I69260ab36fa5eb02c979cea38d0ed2e100e1acbb
diff --git a/ping_common.c b/ping_common.c
index 2bdd6f9..0342e1a 100644
--- a/ping_common.c
+++ b/ping_common.c
@@ -630,6 +630,7 @@
 			fprintf(stderr, "Warning: no SO_TIMESTAMP support, falling back to SIOCGSTAMP\n");
 	}
 #endif
+#ifdef SO_MARK
 	if (options & F_MARK) {
 		int ret;
 
@@ -644,6 +645,7 @@
 			fprintf(stderr, "Warning: Failed to set mark %d\n", mark);
 		}
 	}
+#endif
 
 	/* Set some SNDTIMEO to prevent blocking forever
 	 * on sends, when device is too slow or stalls. Just put limit