samplesshd: allow overriding KEYS_FOLDER by compiler option

Signed-off-by: Andreas Schneider <mail@cynapses.org>

samplesshd.c

@@ -25,11 +25,13 @@ MA 02111-1307, USA. */
 #include <unistd.h>
 #include <string.h>
 #include <stdio.h>
+#ifndef KEYS_FOLDER
 #ifdef _WIN32
 #define KEYS_FOLDER
 #else
 #define KEYS_FOLDER "/etc/ssh/"
 #endif
+#endif
 
 static int auth_password(char *user, char *password){
     if(strcmp(user,"aris"))