add systemFile() helper for arch-aware package paths#251
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Consolidates the four places that constructed paths within the installed package while accounting for the architecture-specific subdirectory used on Windows (e.g. 'lib/x64').
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Follow-up to #250. Four places constructed paths within the installed package while handling the architecture-specific subdirectory used on Windows (
lib/x64vslib): the stub loader inzzz.R, andtbbLibraryPath()/tbbLdFlags()/tbbRoot()intbb.R. Consolidate them into a singlesystemFile()helper inutils.R, next toasBuildPath().No behavior change intended;
systemFile("lib", "tbb.dll")resolves e.g.lib/x64/tbb.dllviasystem.file(), returning "" when absent, matching the previous call sites.