iphplapi: Define IF_NAMESIZE if missing.
diff --git a/dlls/iphlpapi/ifenum.c b/dlls/iphlpapi/ifenum.c
index c6ab7e1..bcd7423 100644
--- a/dlls/iphlpapi/ifenum.c
+++ b/dlls/iphlpapi/ifenum.c
@@ -97,6 +97,10 @@
 #define ETH_ALEN 6
 #endif
 
+#ifndef IF_NAMESIZE
+#define IF_NAMESIZE 16
+#endif
+
 #ifndef INADDR_NONE
 #define INADDR_NONE (~0U)
 #endif