debugger: disable "set target-async on"

Has a tendency to crash gdb, at least release 7.3.1 and today's cvs.

Change-Id: Iba42891ddad000bf97b45d5daf8985d48d4fd977
Reviewed-on: http://codereview.qt-project.org/5617
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/debugger/gdb/remotegdbserveradapter.cpp

@@ -196,7 +196,12 @@ void RemoteGdbServerAdapter::setupInferior()
     // Some external comment: '[but] "set target-async on" with a native
     // windows gdb will work, but then fail when you actually do
     // "run"/"attach", I think..
-    m_engine->postCommand("set target-async on", CB(handleSetTargetAsync));
+
+
+    // ~"/build/buildd/gdb-7.2/gdb/mi/mi-main.c:1958: internal-error:
+    // mi_execute_async_cli_command: Assertion `is_running (inferior_ptid)'
+    // failed.\nA problem internal to GDB has been detected,[...]
+    //m_engine->postCommand("set target-async on", CB(handleSetTargetAsync));
 
     if (fileName.isEmpty()) {
         showMessage(tr("No symbol file given."), StatusBar);