Patch #1495999: Part two of Windows CE changes.

- update header checks, using autoconf
- provide dummies for getenv, environ, and GetVersion
- adjust MSC_VER check in socketmodule.c

Python/ceval.c

@@ -205,7 +205,7 @@ PyEval_GetCallStats(PyObject *self)
 
 #ifdef WITH_THREAD
 
-#ifndef DONT_HAVE_ERRNO_H
+#ifdef HAVE_ERRNO_H
 #include <errno.h>
 #endif
 #include "pythread.h"

Python/dynload_win.c

@@ -2,7 +2,9 @@
 /* Support for dynamic loading of extension modules */
 
 #include <windows.h>
+#ifdef HAVE_DIRECT_H
 #include <direct.h>
+#endif
 #include <ctype.h>
 
 #include "Python.h"

Python/mystrtoul.c

@@ -17,7 +17,7 @@
 
 
 #include <ctype.h>
-#ifndef DONT_HAVE_ERRNO_H
+#ifdef HAVE_ERRNO_H
 #include <errno.h>
 #endif
 

Python/pythonrun.c

@@ -17,7 +17,9 @@
 #include "eval.h"
 #include "marshal.h"
 
+#ifdef HAVE_SIGNAL_H
 #include <signal.h>
+#endif
 
 #ifdef HAVE_LANGINFO_H
 #include <locale.h>

Python/strtod.c

@@ -54,7 +54,7 @@ static	double	HUGE		= 1.7976931348623157e308;
 
 extern	double	atof(const char *);		/* Only called when result known to be ok */
 
-#ifndef DONT_HAVE_ERRNO_H
+#ifdef HAVE_ERRNO_H
 #include <errno.h>
 #endif
 extern	int	errno;

Python/thread_nt.h

@@ -5,7 +5,9 @@
 
 #include <windows.h>
 #include <limits.h>
+#ifdef HAVE_PROCESS_H
 #include <process.h>
+#endif
 
 typedef struct NRMUTEX {
 	LONG   owned ;