Patch from Chris Johns <cjohns@cybertec.com.au> and

Jennifer Averett <jennifer.averett@oarcorp.com> to fix
appends (O_APPEND at open time) on in-memory files.

A call such as:

    fd = open (file, O_APPEND | O_WRONLY);

did not append to the end of the file.

cpukit/libfs/src/imfs/memfile.c

@@ -91,6 +91,9 @@ int memfile_open(
 
   the_jnode = iop->file_info;
 
+  if (iop->flags & LIBIO_FLAGS_APPEND)
+    iop->offset = the_jnode->info.file.size;
+
   return 0;
 }