Don't try to test the RSA command if it is not available.

test/trsa

@@ -3,6 +3,13 @@
 PATH=../apps:$PATH
 export PATH
 
+if ../apps/openssl list-standard-commands | grep '^rsa$' >/dev/null; then
+  echo openssl rsa command available
+else
+  echo openssl rsa command not available, skipping test
+  exit 0
+fi
+
 cmd='../apps/openssl rsa'
 
 if [ "$1"x != "x" ]; then