QNX: Fix debugging on QNX >6.5

The previous approach when debugging on pure QNX 6.5
no longer works with QNX version >6.5. Use proper way with
"set nto-executable" and "run" instead.

Change-Id: I00961236b416c42a0c81e29ea087de5ddd3a5f00
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/debugger/debuggerstartparameters.h

@@ -115,7 +115,6 @@ public:
 
     // Used by remote debugging.
     QString remoteChannel;
-    QString symbolFileName;
     QString serverStartScript;
     QString debugInfoLocation; // Gdb "set-debug-file-directory".
     QStringList debugSourceLocation; // Gdb "directory"