[core] list potentially blocking processes on disk access error

* Using functionality from Process Hacker:
  https://github.com/processhacker2/processhacker2/
* Part of the #773 enhancement
* Also fix minor MinGW and WDK warnings

src/rufus.c

@@ -3469,3 +3469,11 @@ out:
 
 	return 0;
 }
+
+// The old WDK is showing its age and becoming a pain to support
+#if defined(DDKBUILD)
+BOOL SearchProcess(char* HandleName, BOOL bPartialMatch, BOOL bIgnoreSelf) {
+	uprintf("NOTE: Process search is not implemented on this platform");
+	return FALSE;
+}
+#endif