Revert "Import lifecycle (#3902)" (#3904)

This reverts commit f8bcc75.

Author: clauswilke

DESCRIPTION

@@ -254,6 +254,6 @@ Collate:
     'zxx.r'
     'zzz.r'
 VignetteBuilder: knitr
-RoxygenNote: 7.1.0
+RoxygenNote: 7.0.2
 Roxygen: list(markdown = TRUE)
 Encoding: UTF-8

R/zzz.r

@@ -50,6 +50,12 @@ pathGrob <- NULL
   ggplot_global$date_origin <- date - unclass(date)
   time <- Sys.time()
   ggplot_global$time_origin <- time - unclass(time)
+
+  # To avoid namespace clash with dplyr.
+  # It seems surprising that this hack works
+  if (requireNamespace("dplyr", quietly = TRUE)) {
+    vars <<- dplyr::vars
+  }
 }
 
 release_questions <- function() {