fix build for Windows systems * file-stat.cc, oct-syscalls.cc, syscalls.cc: Include <ctime>. * sysdep.cc: Include <shellapi.h> for Windows. * lo-sysdep.cc: Include <fcntl.h> and <io.h> for Windows. * wait-wrappers.c (WIFCONTINUED): Define if sys/wait.h does not. * signal-wrappers.c (octave_kill_wrapper): Return -1 if kill is missing. * main.in.cc (prepare_spawn): Move to unistd-wrappers.c. (octave_exec): Eliminate special case for Windows. (main): Display message if exec fails. * unistd-wrappers.h, fcntl-wrappers.h, lo-sysdep.h: Include <sys/types.h> * unistd-wrappers.c (octave_execv_wrapper): Handle Windows implementation here. Free sanitized command vector if spawnv fails. (octave_getegid_wrapper): Return -1 if getegid is missing. (octave_geteuid_wrapper): Return -1 if geteuid is missing. (octave_getgid_wrapper): Return -1 if getgid is missing. (octave_getpgrp_wrapper): Return -1 if getpgrp is missing. (octave_getpid_wrapper): Return -1 if getpid is missing. (octave_getppid_wrapper): Return -1 if getppid is missing. (octave_getuid_wrapper): Return -1 if getuid is missing. (octave_setsid_wrapper): Return -1 if setsid is missing. * configure.ac: Check for setsid. * lo-sysdep.cc (win_popen2): Move to octave-popen2.c. * lo-sysdep.h (win_popen2): Delete decl. (octave_popen2): Delete deprecated function pointer. * octave-popen2, octave-popen2.c (octave_popen2): New arg, ERRMSG. Handle Windows implemenation here. (make_command_string): New static function. * oct-syscalls.cc (octave::sys::popen2): Eliminate special case for Windows. Defined deprecated inline functions for old octave_popen2 interface. * quit.h: Don't include <windows.h>. (w32_sigint_init, w32_raise_final, w32_raise, w32_in_main_thread): Delete decls of undefined and unused functions. * toplev.cc: Include <windows.h>. * sysdep.cc: Include <windows.h> before <tlhelp32.h> and <shellapi.h>.

--- a/liboctave/system/file-stat.cc	Fri Jun 17 15:18:58 2016 -0700
+++ b/liboctave/system/file-stat.cc	Sat Jun 18 10:55:49 2016 -0400
@@ -24,6 +24,7 @@
 #  include "config.h"
 #endif
 
+#include <ctime>
 #include <cerrno>
 #include <cstring>