Remove Sys.setenv(...) because that time check is working again

.gitlab-ci.yml

@@ -5,9 +5,6 @@
 # with "document = TRUE" (the default), which updates the .Rd files, but then
 # forgetting to commit and push those updated .Rd files.
 
-# Setting the environment variable "_R_CHECK_SYSTEM_CLOCK_" to 0
-# to disable package time check, see issue #54
-
 # Run the R commands under a single "R -e" so everything runs in
 # the same R session.
 # Note for the future: If there are going to be more R commands just put them
@@ -21,7 +18,6 @@
   script:
     - R -e
         "sessionInfo();
-        Sys.setenv('_R_CHECK_SYSTEM_CLOCK_' = 0);
         devtools::install_deps(quiet = TRUE);
         devtools::check(error_on = 'note', document = FALSE)"