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ar: Fix -r flag

When update flag (-u) was added the logic changed and files
were updated only when files were older and -u was passed.
It means that without -u all the files were removed from
the archive.

--- a/src/cmd/ar.c

+++ b/src/cmd/ar.c

@@ -257,10 +257,13 @@

 	char *pname;

 	if (pname = inlist(m->fname, argc, argv)) {

-		if (uflag && older(m, pname))

+		if (!uflag || older(m, pname)) {

 			archive(pname, tmps[m->cur].fp, 'r');

-		return;

-	} else if (posname && !strcmp(posname, m->fname)) {

+			return;

+		}

+	}

+

+	if (posname && !strcmp(posname, m->fname)) {

 		where = (bflag) ? AFTER : BEFORE;

 		m->cur = AFTER;

 	} else {