[monitoring-plugins] Fix build issue with MariaDB 10.2

[Jan Wagner]

    Module: monitoring-plugins
    Branch: maint-2.2
    Commit: ac0437ff896ba9ce2549b2d2ec3de146a886f08a
    Author: Bernard Spil <Sp1l at users.noreply.github.com>
 Committer: Jan Wagner <waja at cyconet.org>
      Date: Mon Nov  6 17:31:44 2017 +0100
       URL: https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=ac0437f

Fix build issue with MariaDB 10.2

As of 10.2 MariaDB no longer defines MYSQL_PORT.

---

 plugins/common.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/plugins/common.h b/plugins/common.h
index 8719b50..6bf4fca 100644
--- a/plugins/common.h
+++ b/plugins/common.h
@@ -174,6 +174,11 @@
  *
  */
 
+/* MariaDB 10.2 client does not set MYSQL_PORT */
+#ifndef MYSQL_PORT
+#  define MYSQL_PORT 3306
+#endif
+
 enum {
 	OK = 0,
 	ERROR = -1