Delete code for old versions of R #6589
Description
There are a few places in the code base that only run if getRversion() < "3.3" (or similar). Since ggplot2 now requires R 4.1, many of these can be deleted.
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There are a few places in the code base that only run if getRversion() < "3.3" (or similar). Since ggplot2 now requires R 4.1, many of these can be deleted.