Debugger: Remove support for non-Python GDB

This affects mainly Apple's version of GDB. Mac users are advised to
use LLDB, or some recent build of FSF GDB.

Change-Id: I6a7fbb591e79f737e12d08b0e881e9e4d1d9660c
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

src/plugins/qmlprojectmanager/qmlprojectrunconfiguration.cpp

@@ -140,16 +140,6 @@ QString QmlProjectRunConfiguration::commandLineArguments() const
     return args;
 }
 
-QString QmlProjectRunConfiguration::dumperLibrary() const
-{
-    return QString();
-}
-
-QStringList QmlProjectRunConfiguration::dumperLibraryLocations() const
-{
-    return QStringList();
-}
-
 QString QmlProjectRunConfiguration::workingDirectory() const
 {
     QFileInfo projectFile(target()->project()->projectFilePath());