Use sys/select.h for select()

Should be more portable to modern systems and could be less portable
to obsolete systems than the traditional sys/time.h sys/types.h
unistd.h incantation.

src/client/play.c

@@ -40,8 +40,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #ifndef _WIN32
-#include <sys/time.h>
-#include <sys/types.h>
+#include <sys/select.h>
 #include <unistd.h>
 #else
 #include <io.h>