Avoid Windows 8 Getversion deprecated errors.

Windows 8 SDKs complain that GetVersion() is deprecated.

We only use GetVersion like this:

	(GetVersion() < 0x80000000)

which checks if the Windows version is NT based. Use a macro check_winnt()
which uses GetVersion() on older SDK versions and true otherwise.
(cherry picked from commit a4cc3c8041)

apps/apps.c

@@ -2841,7 +2841,7 @@ double app_tminterval(int stop,int usertime)
 
 	if (proc==NULL)
 		{
-		if (GetVersion() < 0x80000000)
+		if (check_winnt())
 			proc = OpenProcess(PROCESS_QUERY_INFORMATION,FALSE,
 						GetCurrentProcessId());
 		if (proc==NULL) proc = (HANDLE)-1;

crypto/bio/bss_log.c

@@ -245,7 +245,7 @@ static int MS_CALLBACK slg_puts(BIO *bp, const char *str)
 
 static void xopenlog(BIO* bp, char* name, int level)
 {
-	if (GetVersion() < 0x80000000)
+	if (check_winnt())
 		bp->ptr = RegisterEventSourceA(NULL,name);
 	else
 		bp->ptr = NULL;

crypto/cryptlib.c

@@ -889,7 +889,7 @@ void OPENSSL_showfatal (const char *fmta,...)
 
 #if defined(_WIN32_WINNT) && _WIN32_WINNT>=0x0333
     /* this -------------v--- guards NT-specific calls */
-    if (GetVersion() < 0x80000000 && OPENSSL_isservice() > 0)
+    if (check_winnt() && OPENSSL_isservice() > 0)
     {	HANDLE h = RegisterEventSource(0,_T("OPENSSL"));
 	const TCHAR *pmsg=buf;
 	ReportEvent(h,EVENTLOG_ERROR_TYPE,0,0,0,1,0,&pmsg,0);

crypto/rand/rand_win.c

@@ -750,7 +750,7 @@ static void readscreen(void)
   int		y;		/* y-coordinate of screen lines to grab */
   int		n = 16;		/* number of screen lines to grab at a time */
 
-  if (GetVersion() < 0x80000000 && OPENSSL_isservice()>0)
+  if (check_winnt() && OPENSSL_isservice()>0)
     return;
 
   /* Create a screen DC and a memory DC compatible to screen DC */

e_os.h

@@ -368,6 +368,13 @@ static unsigned int _strlen31(const char *str)
 #    define DEFAULT_HOME  "C:"
 #  endif
 
+/* Avoid Windows 8 SDK GetVersion deprecated problems */
+#if defined(_MSC_VER) && _MSC_VER>=1800
+#  define check_winnt() (1)
+#else
+#  define check_winnt() (GetVersion() < 0x80000000)
+#endif 
+
 #else /* The non-microsoft world */
 
 #  ifdef OPENSSL_SYS_VMS