[R][CI] rtools35 job failing on 32-bit build tests

See https://github.com/apache/arrow/actions/workflows/r.yml?query=branch%3Amaster, this started when ARROW-9697 (CountRows for Scanner) merged. It's only failing on rtools35 (aka gcc 4.9), and only on the 32-bit build (i386). Since there's no output about what failed, it's probably a segfault. The easiest way to get more information is to flip this if: false to true and let it print detailed output about where it was when it died https://github.com/apache/arrow/blob/master/.github/workflows/r.yml#L186