Make buildDirectoryInitialized a Qt4Project specific signal again

And fix it to the old behaviour while at it.

Change-Id: Ifd786e085c621fb3cd59b98cc665d9e3c7fcce51
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>

src/plugins/autotoolsprojectmanager/configurestep.h

@@ -106,8 +106,6 @@ public:
     QString additionalArguments() const;
     QVariantMap toMap() const;
 
-    bool processSucceeded(int exitCode, QProcess::ExitStatus status);
-
 public slots:
     void setAdditionalArguments(const QString &list);