Configurations/unix-Makefile.tmpl: harmonize with no-engine.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6106)
diff --git a/Configurations/unix-Makefile.tmpl b/Configurations/unix-Makefile.tmpl
index 799eaa8..4451232 100644
--- a/Configurations/unix-Makefile.tmpl
+++ b/Configurations/unix-Makefile.tmpl
@@ -369,7 +369,7 @@
 	  RESULT_D=test-runs \
 	  PERL="$(PERL)" \
 	  EXE_EXT={- $exeext -} \
-	  OPENSSL_ENGINES=`cd ../$(BLDDIR)/engines; pwd` \
+	  OPENSSL_ENGINES=`cd ../$(BLDDIR)/engines 2>/dev/null && pwd` \
 	  OPENSSL_DEBUG_MEMORY=on \
 	    $(PERL) ../$(SRCDIR)/test/run_tests.pl $(TESTS) )
 	@ : {- if ($disabled{tests}) { output_on(); } else { output_off(); } "" -}