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ARROW-8586: [R] installation failure on CentOS 7

This resolves some of the issues reported in the JIRA:

* The centos-7 binary is now correctly identified if the lsb_release command is installed
* A note is added explaining how to work around the compiler issue the user experienced

Closes #7183 from nealrichardson/r-distro

Authored-by: Neal Richardson <neal.p.richardson@gmail.com>
Signed-off-by: Neal Richardson <neal.p.richardson@gmail.com>