ARROW-4845: [R] Compiler warnings on Windows MingW64#4511

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Commits on Jun 12, 2019

using size_t instead of int64_t, -Wsign-compare
romainfrancois
committed
more idiomatic c++ range based for loop
romainfrancois
committed
not echo line number in arrowExports.cpp, as this would create some unnecessary changes
romainfrancois
committed