Use ostream_put from Boost.IO

meta/libraries.json

@@ -85,19 +85,6 @@
             "Daniel Frey <d.frey -at- gmx.de>"
         ]
     },
-    {
-        "key": "utility/ostream_string",
-        "name": "ostream_string",
-        "description": "String formatted output function.",
-        "documentation": "doc/html/ostream_string.html",
-        "category": [
-            "IO"
-        ],
-        "authors": "Glen Fernandes",
-        "maintainers": [
-            "Glen Fernandes <glenjofe -at- gmail.com>"
-        ]
-    },
     {
         "key": "utility/result_of",
         "name": "Result Of",