Changed pattern in gdb_run_cmd to match up to the first newline only.

The old pattern used ".*$", which could, and did, swallow up output
that we were attempting to match elsewhere.

gdb/testsuite/lib/gdb.exp

@@ -123,7 +123,10 @@ proc gdb_run_cmd {} {
 	    exp_continue
 	}
 
-	-re "Starting program: .*$" {}
+	# The following pattern matches up to to the first newline *only*.
+	# Using ``.*$'' could swallow up output that we attempt to match
+	# elsewhere.
+	-re "Starting program: \[^\n\]*" {}
     }
 }