Update to 7-Zip Version 19.00

- Encryption strength for 7z archives was increased the size of random
  initialization vector was increased from 64-bit to 128-bit, and the
  pseudo-random number generator was improved.
- Some bugs were fixed.

C/DllSecur.h

@@ -1,5 +1,5 @@
 /* DllSecur.h -- DLL loading for security
-2016-06-08 : Igor Pavlov : Public domain */
+2018-02-19 : Igor Pavlov : Public domain */
 
 #ifndef __DLL_SECUR_H
 #define __DLL_SECUR_H
@@ -10,6 +10,7 @@ EXTERN_C_BEGIN
 
 #ifdef _WIN32
 
+void My_SetDefaultDllDirectories();
 void LoadSecurityDlls();
 
 #endif