Fix compilation with Qt4

Change-Id: I537c800bb29cfcaf8e8242122a7a1fd7d89d7d7e
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/texteditor/snippets/snippet.cpp

@@ -42,6 +42,8 @@ const char UCMANGLER_ID[] = "TextEditor::UppercaseMangler";
 const char LCMANGLER_ID[] = "TextEditor::LowercaseMangler";
 const char TCMANGLER_ID[] = "TextEditor::TitlecaseMangler";
 
+Q_DECLARE_METATYPE(QList<int>)
+
 // --------------------------------------------------------------------
 // Manglers:
 // --------------------------------------------------------------------