just remove (unenforced) provision for very old R

Author: MichaelChirico

.dev/CRAN_Release.cmd

@@ -95,19 +95,6 @@ grep "PROTECT_PTR" ./src/*.c
 # No use of long long, instead use int64_t. TODO
 # grep "long long" ./src/*.c
 
-// No use of llu, lld, td or tu
-grep -nE "%(ll|t)[ud]\b" src/*.[hc]
-// Comment moved here from fread.c on 19 Nov 2019
-// [Moved from fread.c on 19 Nov 2019] On Windows variables of type `size_t` cannot be printed
-//   with "%zu" in the `snprintf()` function. For those variables we used to cast them into
-//   `unsigned long long int` before printing, and defined (llu) to make the cast shorter.
-//   We're now observing warnings from gcc-8 with -Wformat-extra-args, #4062. So
-//   now we're more strict and cast to [u]int64_t and use PRIu64/PRId64 from <inttypes.h>
-//   In many cases the format specifier is passed to our own macro (e.g. DTPRINT) or to Rprintf(),
-//   error() etc, and even if they don't call sprintf() now, they could in future.
-// td is for ptrdiff_t from C99; it's not available in old versions of Rtools (e.g. for R<4.2.0),
-//   see https://github.com/Rdatatable/data.table/pull/6970#issuecomment-2877636459.
-
 # No tabs in C or R code (sorry, Richard Hendricks)
 grep -P "\t" ./R/*.R
 grep -P "\t" ./src/*.c