Use same default as rcmdcheck itself (#2457)

* Use same default as rcmdcheck itself

Related to #2448 and r-lib/rcmdcheck#185

* Add NEWS bullet

Author: jennybc

NEWS.md

@@ -1,5 +1,8 @@
 # devtools (development version)
 
+* `check(check_dir = NULL)` is the new default, to align with the default
+  behaviour of the underlying `rcmdcheck::rcmdcheck()`.
+
 * `check(cleanup =)` was deprecated in devtools v1.11.0 (2016-04-12) and was
   made defunct in v2.4.4 (2022-07-20). The documentation is more clear now about
   recommended alternatives.

R/check.R

@@ -65,7 +65,7 @@ check <- function(pkg = ".",
                   args = "--timings",
                   env_vars = c(NOT_CRAN = "true"),
                   quiet = FALSE,
-                  check_dir = tempdir(),
+                  check_dir = NULL,
                   cleanup = deprecated(),
                   vignettes = TRUE,
                   error_on = c("never", "error", "warning", "note")) {