Stop `CApp` from assuming `Messages` in installed in `resources`
By contrast with `INSTRES_FILES` in `CModule`, where `Messages` is implicitly included, `CApp` and `BasicApp` do not do this for `RES_FILES`. The native- compilation version of `CApp` was doing duplicate installations of `Messages`, which was at odds with the cross-compiling `CApp` and both versions of `BasicApp`. If this version of `CApp` is used with a component that doesn't feature a `Messages` file (such as the in-development `InetRes`) this results in an error. The only existing `CApp` client components that define `RES_FILES` are `Help2` and `EditApp`, and they both explicitly list `Messages`, so this change should not break either of them.
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