Fix a couple of C++ related problems in include/cxx

include/cxx/cfcntl

@@ -49,7 +49,7 @@
 namespace std
 {
   using ::flock;
-  using ::creat;
+//using ::creat;
   using ::open;
   using ::fcntl;
 }

include/cxx/cunistd

@@ -59,6 +59,8 @@ namespace std
   using ::lseek;
   using ::read;
   using ::write;
+  using ::pread;
+  using ::pwrite;
   using ::pipe;
   using ::chdir;
   using ::getcwd;