Some systems (HP-UX) don't yet have <sys/select.h>, putting select() in

<sys/time.h>.  Cope with this.  Where <sys/select.h> _is_ available, though,
use it (since it's where POSIX puts select()).  Problem reported by Mike
Protts.

[originally from svn r6310]

unix/uxplink.c

@@ -13,7 +13,10 @@
 #include <termios.h>
 #include <pwd.h>
 #include <sys/ioctl.h>
+#include <sys/time.h>
+#ifndef HAVE_NO_SYS_SELECT_H
 #include <sys/select.h>
+#endif
 
 #define PUTTY_DO_GLOBALS	       /* actually _define_ globals */
 #include "putty.h"