New review comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/pull/26824#discussion_r532756553

Comment:
@pbui use

```
diff --git a/ell/dhcp-server.c b/ell/dhcp-server.c
index c983ed4..144e83e 100644
--- ell/dhcp-server.c
+++ ell/dhcp-server.c
@@ -24,6 +24,7 @@
 #include <config.h>
 #endif
 
+#include <linux/types.h>
 #include <net/ethernet.h>
 #include <sys/socket.h>
 #include <arpa/inet.h>
```

instead