rtprtx: Provide an ssrc in the test

And increase timeout to allow all tests to run in valgrind.

tests/check/elements/rtprtx.c

@@ -38,6 +38,7 @@ static GMainLoop *main_loop;
     "media = (string)audio, "           \
     "payload = (int) 0, "               \
     "clock-rate = (int) 8000, "         \
+    "ssrc = (uint) 42, "                \
     "encoding-name = (string)PCMU"
 
 #define RTP_FRAME_SIZE 20
@@ -1495,7 +1496,7 @@ rtprtx_suite (void)
   Suite *s = suite_create ("rtprtx");
   TCase *tc_chain = tcase_create ("general");
 
-  tcase_set_timeout (tc_chain, 10);
+  tcase_set_timeout (tc_chain, 120);
 
   suite_add_tcase (s, tc_chain);