Remove another "interrupt to quit" message

* strace.c (startup_attach): Remove another "interrupt to quit" message.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/strace.c b/strace.c
index 17ee749..0ea640f 100644
--- a/strace.c
+++ b/strace.c
@@ -932,7 +932,7 @@
 
 		if (!qflag)
 			fprintf(stderr,
-				"Process %u attached - interrupt to quit\n",
+				"Process %u attached\n",
 				tcp->pid);
 	} /* for each tcbtab[] */