According to POSIX.1-2001, POSIX.1-2008 #include <sys/select.h> is correct way to get fd_set

bin/tests/optional/zone_test.c

@@ -12,6 +12,7 @@
 #include <config.h>
 
 #include <sys/param.h>
+#include <sys/select.h>
 #include <sys/types.h>
 #include <sys/time.h>
 
@@ -35,10 +36,6 @@
 #include <dns/result.h>
 #include <dns/zone.h>
 
-#ifdef ISC_PLATFORM_NEEDSYSSELECTH
-#include <sys/select.h>
-#endif
-
 static int debug = 0;
 static int quiet = 0;
 static int stats = 0;