CppTools: Fix build

Amends 97828a96af and ef8de6a384.

Change-Id: I9dd7d6a093657ea6f20ff3b5a4d0c968f8293ad7
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/cpptools/compileroptionsbuilder.cpp

@@ -576,7 +576,7 @@ void CompilerOptionsBuilder::addWrappedQtHeadersIncludePath(QStringList &list) c
 QString CompilerOptionsBuilder::includeDirOptionForSystemPath(ProjectExplorer::HeaderPathType type) const
 {
     if (type == ProjectExplorer::HeaderPathType::Framework)
-        return "-F";
+        return QString("-F");
 
     if (m_useSystemHeader == UseSystemHeader::Yes)
         return includeSystemPathOption;

src/plugins/cpptools/cpptools.qbs

@@ -188,6 +188,8 @@ Project {
             "functionutils.h",
             "generatedcodemodelsupport.cpp",
             "generatedcodemodelsupport.h",
+            "headerpathfilter.cpp",
+            "headerpathfilter.h",
             "includeutils.cpp",
             "includeutils.h",
             "indexitem.cpp",