Utils: Store Device::osType in settings

Change-Id: I41348be752598b7a8d1f1979764e7111cccc95a9
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/libs/utils/filepath.h

@@ -291,6 +291,7 @@ public:
     std::function<bool(const FilePath &left, const FilePath &right)> isSameDevice;
     std::function<expected_str<FilePath>(const FilePath &)> localSource;
     std::function<void(const FilePath &, const Environment &)> openTerminal;
+    std::function<OsType(const FilePath &)> osType;
 };
 
 // For testing