Don't use rdtsc for high res timestamp on Linux as it's highly inaccurate (for now)

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@387 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/pjlib/src/pjlib-test/timestamp.c b/pjlib/src/pjlib-test/timestamp.c
index 4207d95..4843540 100644
--- a/pjlib/src/pjlib-test/timestamp.c
+++ b/pjlib/src/pjlib-test/timestamp.c
@@ -99,6 +99,9 @@
 			     "%d msec", 
 			     (pj_uint32_t)(diff * 1000000 / freq.u64), 
 			     msec));
+    } else {
+	PJ_LOG(3,(THIS_FILE, "....good. Timestamp is accurate down to"
+			     " nearest usec."));
     }
 
     return 0;