Debugger: Use LD_PRELOAD to load debugging helper.

on UNIX. Either set the LD_PRELOAD environment variable
using a gdb command or have the TermGdbAdapter set the
variable for the debuggee. For the remote adapter,
switch on toolchain. dlopen() is a fallback for
platforms where it is not supported and attaching
to running processes. Fixes a crash with gdb 7.0
(and spurious gdb 6.8 crashes with dlopen()).
Reviewed-by: hjk <qtc-committer@nokia.com>

src/plugins/debugger/gdb/remotegdbadapter.h

@@ -46,9 +46,9 @@ class RemoteGdbAdapter : public AbstractGdbAdapter
     Q_OBJECT
 
 public:
-    RemoteGdbAdapter(GdbEngine *engine, QObject *parent = 0);
+    RemoteGdbAdapter(GdbEngine *engine, int toolChainType, QObject *parent = 0);
 
-    bool dumpersAvailable() const { return true; }
+    virtual DumperHandling dumperHandling() const;
 
     void startAdapter();
     void startInferior();
@@ -67,6 +67,8 @@ private:
     void handleFileExecAndSymbols(const GdbResponse &response);
     void handleTargetRemote(const GdbResponse &response);
 
+    const int m_toolChainType;
+
     QProcess m_uploadProc;
 };