CppCheck: Use more FilePath

Change-Id: I45da67df4b76032303b57f567d73ae01bf9f2e91
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/cppcheck/cppcheckoptions.h

@@ -26,6 +26,7 @@
 #pragma once
 
 #include <coreplugin/dialogs/ioptionspage.h>
+#include <utils/filepath.h>
 
 #include <QCoreApplication>
 #include <QPointer>
@@ -36,9 +37,7 @@ class QLineEdit;
 class QCheckBox;
 QT_END_NAMESPACE
 
-namespace Utils {
-class PathChooser;
-}
+namespace Utils { class PathChooser; }
 
 namespace Cppcheck {
 namespace Internal {
@@ -50,7 +49,7 @@ class OptionsWidget;
 class CppcheckOptions final
 {
 public:
-    QString binary;
+    Utils::FilePath binary;
 
     bool warning = true;
     bool style = true;