the linux headers have started adding shims to not define types or structs
when C lib headers are active, but in order to work, the C lib headers have
to be included before the linux headers.

move the netinet/in.h include up above the linux/ includes.

Mike Frysinger <vapier@gentoo.org>

--- a/src/pppoe.h
+++ b/src/pppoe.h
@@ -47,6 +47,8 @@
 #include <sys/socket.h>
 #endif
 
+#include <netinet/in.h>
+
 /* Ugly header files on some Linux boxes... */
 #if defined(HAVE_LINUX_IF_H)
 #include <linux/if.h>
@@ -84,8 +86,6 @@ typedef unsigned long UINT32_t;
 #include <linux/if_ether.h>
 #endif
 
-#include <netinet/in.h>
-
 #ifdef HAVE_NETINET_IF_ETHER_H
 #include <sys/types.h>