Codepaster: Compile with QT_NO_CAST_FROM_ASCII.

- Change the diff parsing to use QString reducing the
  conversions.

Change-Id: Id4d84947479a14d58b8a60157a98a56db5a89ddb
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>

src/plugins/cpaster/pasteview.h

@@ -69,7 +69,7 @@ public:
     QString user() const;
     QString description() const;
     QString comment() const;
-    QByteArray content() const;
+    QString content() const;
     QString protocol() const;
 
     virtual void accept();