jsoncpp: Build the library within CMake

Update json/json.h to account for our lack of autolink.h.  Update
json/config.h to include KWSys Large File Support configuration so that
consistent stream libraries are used (on AIX with XL).

Add a cm_jsoncpp_reader.h header to include the CMake-provided copy of
the json/reader.h header from CMake sources.

Utilities/cmjsoncpp/include/json/config.h

@@ -6,6 +6,9 @@
 #ifndef JSON_CONFIG_H_INCLUDED
 #define JSON_CONFIG_H_INCLUDED
 
+// Include KWSys Large File Support configuration.
+#include <cmsys/Configure.h>
+
 /// If defined, indicates that json library is embedded in CppTL library.
 //# define JSON_IN_CPPTL 1
 

Utilities/cmjsoncpp/include/json/json.h

@@ -6,7 +6,6 @@
 #ifndef JSON_JSON_H_INCLUDED
 #define JSON_JSON_H_INCLUDED
 
-#include "autolink.h"
 #include "value.h"
 #include "reader.h"
 #include "writer.h"