Add missing #include <netinet/in_systm.h> and #include <netinet/in.h>.

diff --git a/dlls/wininet/ftp.c b/dlls/wininet/ftp.c
index 56aefb3..562fa88 100644
--- a/dlls/wininet/ftp.c
+++ b/dlls/wininet/ftp.c
@@ -20,6 +20,8 @@
 #endif
 #include <sys/stat.h>
 #include <unistd.h>
+#include <netinet/in_systm.h>
+#include <netinet/in.h>
 #include <netinet/ip.h>
 
 #include "winbase.h"