fix regex to check format of client signature

Jan Willamowius

2019-04-22 4093b38f678b4d253b610f3439adb9e950e37c92

 src/tools/base_lib/win/CryptoHelperWindows.h

@@ -27,6 +27,7 @@
   HCRYPTPROV m_hCryptProv;

   //   Handle to the cryptography key.

   HCRYPTKEY m_hCryptKey;

   void printHash(HCRYPTHASH* hHash) const;

public:

   CryptoHelperWindows();