one moire constexpr string -> const string

Signed-off-by: Lauris Kaplinski <[email protected]>

Author: Lauris Kaplinski

test/libcdoc_boost.cpp

@@ -17,7 +17,7 @@ using namespace std;
 /**
  * @brief Unencrypted file name.
  */
-constexpr string SourceFile("test_data.txt");
+const string SourceFile("test_data.txt");
 
 /**
  * @brief Encrypted file name.