Bug 20729: Fix build failures on ppc64 and other arches.

The changes to fix bug 20729 introduced an error which removed an
ignore diagnostic from -O2 by using the new -Os related macro.
This broke ppc64 builds. This commit fixes the mistake.

Tested on x86, x86_64, ppc64, ppc64le, arm, aarch64, and s390x.

ChangeLog

@@ -1,3 +1,11 @@
+2016-11-02  Florian Weimer  <fweimer@redhat.com>
+	    Carlos O'Donell  <carlos@redhat.com>
+
+	[Bug #20729]
+	* resolv/res_send.c (send_vc): Revert DIAG_IGNORE_Os_NEEDS_COMMENT
+	change to non -Os related diagnostic.  Use DIAG_IGNORE_Os_NEEDS_COMMENT
+	for -Os related change.
+
 2016-11-01  Steve Ellcey  <sellcey@caviumnetworks.com>
 
 	* stdio-common/tst-printf.c: Ignore -Wformat-length warning.

resolv/res_send.c

@@ -664,7 +664,7 @@ send_vc(res_state statp,
 	   a false-positive.
 	 */
 	DIAG_PUSH_NEEDS_COMMENT;
-	DIAG_IGNORE_Os_NEEDS_COMMENT (5, "-Wmaybe-uninitialized");
+	DIAG_IGNORE_NEEDS_COMMENT (5, "-Wmaybe-uninitialized");
 	int resplen;
 	DIAG_POP_NEEDS_COMMENT;
 	struct iovec iov[4];
@@ -937,7 +937,7 @@ reopen (res_state statp, int *terrno, int ns)
 		   the function return -1 before control flow reaches
 		   the call to connect with slen.  */
 		DIAG_PUSH_NEEDS_COMMENT;
-		DIAG_IGNORE_NEEDS_COMMENT (5, "-Wmaybe-uninitialized");
+		DIAG_IGNORE_Os_NEEDS_COMMENT (5, "-Wmaybe-uninitialized");
 		if (connect(EXT(statp).nssocks[ns], nsap, slen) < 0) {
 		DIAG_POP_NEEDS_COMMENT;
 			Aerror(statp, stderr, "connect(dg)", errno, nsap);