patch 9.1.0518: initialize the random buffer can be improved

Problem:  initialize the random buffer can be improved
Solution: refactor init_srand() function, move machine-specific parts to
          os_mswin and os_unix, implement a fallback for Windows 10 and
          later (LemonBoy)

closes: #15125

Signed-off-by: LemonBoy <thatlemon@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    518,
 /**/
     517,
 /**/