Zabbix

...G...... [DEV-1434] added net.dns, net.dns.record, vfs.dir.count, vfs.dir.size metric support to agent2 on windows

* commit 'c7b3eed670171325bca880c57e2a15a0d9616c2b':
  .......... [DEV-1434] fixed warning of windows agent2 compilation
  .......... [DEV-1434] fixed zabbix_agentd compiling
  .......... [DEV-1434] added vfs.dir.* metric support
  .......... [DEV-1434] fixed windows dns metrics
  .......... [DEV-1434] add net.dns, net.dns.record supoprt via C code
  .......... [DEV-1434] moved dns metrics to separate file