Update to OpenSSL 1.1.1c in preparation for Qt 5.12.4/5.13

libs/windows/include/openssl/pem2.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 1999-2018 The OpenSSL Project Authors. All Rights Reserved.
  *
  * Licensed under the OpenSSL license (the "License").  You may not use
  * this file except in compliance with the License.  You can obtain a copy
@@ -7,14 +7,7 @@
  * https://www.openssl.org/source/license.html
  */
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#ifndef HEADER_PEM_H
-int ERR_load_PEM_strings(void);
-#endif
-
-#ifdef __cplusplus
-}
+#ifndef HEADER_PEM2_H
+# define HEADER_PEM2_H
+# include <openssl/pemerr.h>
 #endif