Remove should_run_benchmarks() where not used

Author: DavisVaughan

vignettes/converting.Rmd

@@ -12,10 +12,6 @@ knitr::opts_chunk$set(
   collapse = TRUE,
   comment = "#>"
 )
-
-should_run_benchmarks <- function(x) {
-  get("requireNamespace")("cpp11test", quietly = TRUE) && asNamespace("cpp11test")$should_run_benchmarks()
-}
 ```
 
 In many cases there is no need to convert a package from Rcpp.