CppTools: Fix compilation with recent gcc 4.9.2

See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62224

.obj/release-shared/cppcodemodelinspectordialog.o: In function `CppEditor::Internal::CppCodeModelInspectorDialog::refresh()':
cppcodemodelinspectordialog.cpp:(.text+0x79fc): undefined reference to `CppTools::Internal::CppModelManager::ensureUpdated()'
.obj/release-shared/cppcodemodelinspectordialog.o: In function `CppTools::Internal::CppModelManager::definedMacros()':
cppcodemodelinspectordialog.cpp:+0x26): undefined reference to `CppTools::Internal::CppModelManager::ensureUpdated()'
.obj/release-shared/cppcodemodelinspectordialog.o: In function `CppTools::Internal::CppModelManager::headerPaths()':
cppcodemodelinspectordialog.cpp: +0x26): undefined reference to `CppTools::Internal::CppModelManager::ensureUpdated()'

Change-Id: Ie0e01f7628668cbbe11b701a93caef98bb8e335f
Reviewed-by: Adam Majer <adamm@zombino.com>
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>
(cherry picked from commit c023a1cac1)
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/cpptools/cppmodelmanager.cpp

@@ -920,6 +920,24 @@ CppIndexingSupport *CppModelManager::indexingSupport()
     return m_indexingSupporter ? m_indexingSupporter : m_internalIndexingSupport;
 }
 
+QStringList CppModelManager::projectFiles()
+{
+    ensureUpdated();
+    return m_projectFiles;
+}
+
+ProjectPart::HeaderPaths CppModelManager::headerPaths()
+{
+    ensureUpdated();
+    return m_headerPaths;
+}
+
+QByteArray CppModelManager::definedMacros()
+{
+    ensureUpdated();
+    return m_definedMacros;
+}
+
 void CppModelManager::enableGarbageCollector(bool enable)
 {
     m_delayedGcTimer->stop();