Read constants from the RTS unit
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Read constants from DerivedConstants.h in the RTS unit instead of from the globally installed platformConstants (no longer produced after this patch). It allows us to have a single source of truth (the header file) used for C/Cmm/Hs codes and more importantly to start supporting more than one target platform.
It is particularly useful for #14335 which needs a different Platform for the host for plugins and Platform needs platform constants.