ARROW-7103: [R] Various minor cleanups #5796
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covrfrom Suggests so that it is not installed in CI; add a note to the README about how to use it (following ARROW-7067)install_github()because it's unlikely to work (based on user reports)ARROW_R_CXXFLAGSto before where a debug message prints the flags being usedboost_filesystemfrom lib flags for macOS and Windows build scripts (following ARROW-6743)