ProjectExplorer: extended Toolchain::CompilerFlags

Now it provides information about C language standard and C++
extensions. No new behavior added to project managers.

Change-Id: Ib7c19641f452a75c9b14cd7e33d104dcd1603720
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/plugins/projectexplorer/customtoolchain.cpp

@@ -141,8 +141,8 @@ ToolChain::CompilerFlags CustomToolChain::compilerFlags(const QStringList &cxxfl
 {
     foreach (const QString &cxx11Flag, m_cxx11Flags)
         if (cxxflags.contains(cxx11Flag))
-            return STD_CXX11;
-    return NO_FLAGS;
+            return StandardCxx11;
+    return NoFlags;
 }
 
 ToolChain::WarningFlags CustomToolChain::warningFlags(const QStringList &cxxflags) const