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

Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6106)

Configurations/unix-Makefile.tmpl

@@ -369,7 +369,7 @@ test: tests
 	  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(); } "" -}