Don't use unique_ptr on pre-c++11 branch

Don't use C++11 unique_ptr in the 0.y.z branch.
Although this usage is guarded with __cplusplus >= 201103
some build configurations (notably chromium) use a
C++11-compliant compiler but a pre-11 library.

pull open-source-parsers#238

Author: sbc100

src/lib_json/json_reader.cpp

@@ -32,11 +32,7 @@ static int       stackDepth_g = 0;  // see readValue()
 
 namespace Json {
 
-#if __cplusplus >= 201103L
-typedef std::unique_ptr<CharReader> CharReaderPtr;
-#else
 typedef std::auto_ptr<CharReader>   CharReaderPtr;
-#endif
 
 // Implementation of class Features
 // ////////////////////////////////

src/lib_json/json_writer.cpp

@@ -40,11 +40,7 @@
 
 namespace Json {
 
-#if __cplusplus >= 201103L
-typedef std::unique_ptr<StreamWriter> StreamWriterPtr;
-#else
 typedef std::auto_ptr<StreamWriter>   StreamWriterPtr;
-#endif
 
 static bool containsControlCharacter(const char* str) {
   while (*str) {