OpenBSD (and NetBSD) whereis don't support -b

Index: LibreNMS/Validations/System.php
--- LibreNMS/Validations/System.php.orig
+++ LibreNMS/Validations/System.php
@@ -40,7 +40,7 @@ class System extends BaseValidation
     {
         $install_dir = $validator->getBaseDir();
 
-        $lnms = str_replace('lnms:', '', rtrim(`whereis -b lnms 2>/dev/null`));
+        $lnms = str_replace('lnms:', '', rtrim(`whereis lnms 2>/dev/null`));
         $path = rtrim(`echo "\$PATH"`);
 
         // if couldn't find lnms and we have PATH