This patch fixes 100% reproducible test failures on arm-linux-gnueabihf in our
the build environment chroot, as reported at <https://bugs.gnu.org/26253>,
and now on x86_64-linux-gnu as well.  It is a variant of this upstream patch:

  commit f5422009389678680dba9ff4ecb7d33632ee3383
  Author: Ludovic Courtès <ludo@gnu.org>
  Date:   Mon Mar 27 20:34:39 2017 -0700

      tests: avoid false ulimit failure on some systems

      * tests/misc/cut-huge-range.sh: On some systems returns_ may
      use more memory, so incorporate that in the determination
      of the ulimit value to use.  Noticed on ARMv7 with bash-4.4.12,
      and x86_64 with bash-4.2.37.
      Fixes http://bugs.gnu.org/26253

... which appeared to be insufficient.

diff --git a/tests/misc/cut-huge-range.sh b/tests/misc/cut-huge-range.sh
index 6b3c5b6ed..55b7b640e 100755
--- a/tests/misc/cut-huge-range.sh
+++ b/tests/misc/cut-huge-range.sh
@@ -20,9 +20,9 @@
 print_ver_ cut
 getlimits_
 
-vm=$(get_min_ulimit_v_ cut -b1 /dev/null) \
+vm=$(get_min_ulimit_v_ sh -c 'cut -b1 /dev/null') \
   || skip_ "this shell lacks ulimit support"
 vm=$(($vm + 1000)) # avoid spurious failures
 
 # sed script to subtract one from the input.
 # Each input line should consist of a positive decimal number.