randomconfig fixes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

testsuite/mount.tests

@@ -34,6 +34,8 @@ umount -d "$testdir" 2>/dev/null
 #   file input will be file called "input"
 #   test can create a file "actual" instead of writing to stdout
 
+# This will always fail on !CONFIG_MANDATORY_FILE_LOCKING kernels
+test "$SKIP_MOUNT_MAND_TESTS" = "1" || \
 testing "mount -o remount,mand" \
 "mount -o loop mount.image1m $testdir "\
 "&& grep -Fc $testdir </proc/mounts "\

testsuite/xargs.tests

@@ -61,7 +61,7 @@ testing "xargs -n2" \
 
 SKIP=
 
-optional FEATURE_XARGS_SUPPORT_QUOTES
+optional FEATURE_XARGS_SUPPORT_QUOTES FEATURE_XARGS_SUPPORT_REPL_STR
 testing "xargs -I skips empty lines and leading whitespace" \
 	"xargs -I% echo '[%]'" \
 	"[2]\n[4]\n[6 6 ]\n[7]\n" \