fixdep: remove unnecessary <arpa/inet.h> inclusion

<arpa/inet.h> was included for ntohl(), but it was removed by
commit dee81e9886 ("fixdep: faster CONFIG_ search").

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

scripts/basic/fixdep.c

@@ -112,7 +112,6 @@
 #include <stdio.h>
 #include <limits.h>
 #include <ctype.h>
-#include <arpa/inet.h>
 
 int insert_extra_deps;
 char *target;