xargs tests: Disable the test added in commit eab91d0081

This test has been triggering OOM kills in CI runs since it triggers an
allocation of 16GB.  Temporarily disable the test until the problem is
solved one way or another.

usr.bin/xargs/tests/regress.sh

@@ -1,6 +1,6 @@
 # $FreeBSD$
 
-echo 1..22
+echo 1..21
 
 REGRESSION_START($1)
 
@@ -13,7 +13,9 @@ REGRESSION_TEST(`R', `xargs -I% -R1 echo The % % % %% % % <${SRCDIR}/regress.in'
 REGRESSION_TEST(`R-1', `xargs -I% -R-1 echo The % % % %% % % <${SRCDIR}/regress.in')
 REGRESSION_TEST(`n1', `xargs -n1 echo <${SRCDIR}/regress.in')
 REGRESSION_TEST(`n2', `xargs -n2 echo <${SRCDIR}/regress.in')
-REGRESSION_TEST(`n2147483647', `xargs -n2147483647 <${SRCDIR}/regress.in')
+# This test may consume a large amount of memory, making it unsuited to CI
+# environments.  Disable it for now.
+#REGRESSION_TEST(`n2147483647', `xargs -n2147483647 <${SRCDIR}/regress.in')
 REGRESSION_TEST(`n2P0',`xargs -n2 -P0 echo <${SRCDIR}/regress.in | sort')
 REGRESSION_TEST(`n3', `xargs -n3 echo <${SRCDIR}/regress.in')
 REGRESSION_TEST(`0', `xargs -0 -n1 echo <${SRCDIR}/regress.0.in')