CppTools: added ProjectPart::evaluateToolchain()

At this moment each project manager duplicates code that reads C++ code
model information from ProjectExplorer::ToolChain.
This change provides unified way.

Change-Id: If9ecfc40991aab90768dd69f5f10f31bbf5fbc21
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/plugins/cpptools/cppmodelmanagerinterface.h

@@ -43,8 +43,12 @@
 
 namespace Core { class IEditor; }
 namespace CPlusPlus { class LookupContext; }
-namespace ProjectExplorer { class Project; }
+namespace ProjectExplorer {
+class Project;
+class ToolChain;
+}
 namespace TextEditor { class BaseTextEditor; }
+namespace Utils { class FileName; }
 
 namespace CppTools {
 class AbstractEditorSupport;
@@ -65,6 +69,11 @@ public:
         , qtVersion(UnknownQt)
     {}
 
+    void evaluateToolchain(const ProjectExplorer::ToolChain *tc,
+                           const QStringList &cxxflags,
+                           const QStringList &cflags,
+                           const Utils::FileName &sysRoot);
+
 public:
     enum CVersion {
         C89,