target cert.openssl-text: do not export cert in pem format

Makefile

@@ -13,7 +13,7 @@ cert.pem : cert.der
 	openssl x509 -inform der -in $^ -outform pem -out $@
 
 cert.openssl-text : cert.pem
-	openssl x509 -in $^ -text > $@
+	openssl x509 -in $^ -text -noout > $@
 
 clean :
 	-trash gpgsm-params