Suppress fault display on startup

If GDB is just attaching, we don't want to send the verbose output
indicating the cause of a fault since GDB gets very confused by it.
This confusion will even result in a 2 second timeout before MRI and
GDB re-synchronize.

Author: adamgreen

libraries/ThreadMRI/src/core/mri.c

@@ -200,7 +200,8 @@ void mriDebugException(void)
         return;
     }
 
-    Platform_DisplayFaultCauseToGdbConsole();
+    if (!IsFirstException())
+        Platform_DisplayFaultCauseToGdbConsole();
     Send_T_StopResponse();
 
     GdbCommandHandlingLoop();