uClibc++ compiles... but it is a long way from linking

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5293 42af7a65-404d-4744-a932-0658087f49c3

include/cxx/cstdio

@@ -52,6 +52,8 @@ namespace std
   using ::FILE;
   using ::fpos_t;
   using ::size_t;
+
+  using ::clearerr;
   using ::fclose;
   using ::fflush;
   using ::feof;
@@ -69,16 +71,24 @@ namespace std
   using ::ftell;
   using ::fwrite;
   using ::gets;
+  using ::ungetc;
+
   using ::printf;
   using ::puts;
   using ::rename;
   using ::sprintf;
+  using ::asprintf;
   using ::snprintf;
-  using ::ungetc;
+  using ::sscanf;
+  using ::perror;
+
   using ::vprintf;
   using ::vfprintf;
   using ::vsprintf;
+  using ::avsprintf;
   using ::vsnprintf;
+  using ::vsscanf;
+
   using ::fdopen;
   using ::statfs;
 }