example21.cpp: remove deprecated code

The deprecated code was no longer used, so remove it to avoid
compiling failure with -Werror=unused-function
...
| example21.cpp:51:8: error: 'size_t {anonymous}::readData(char*,
size_t, size_t)' defined but not used [-Werror=unused-function]
|  size_t readData(char *buffer, size_t size, size_t nitems)
...

Upstream-Status: Pending

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
---
 examples/example21.cpp | 17 -----------------
 1 file changed, 17 deletions(-)

diff --git a/examples/example21.cpp b/examples/example21.cpp
--- a/examples/example21.cpp
+++ b/examples/example21.cpp
@@ -39,23 +39,6 @@
 #include <curlpp/Options.hpp>
 #include <curlpp/Exception.hpp>
  
-/*
-   anonymous namespace to prevent name clash in case other examples using the same global entities
-   would be compiled in the same project
-*/
-namespace
-{
-
-char *data = NULL;
-
-size_t readData(char *buffer, size_t size, size_t nitems)
-{
-  strncpy(buffer, data, size * nitems);
-  return size * nitems;
-}
-
-} // namespace
-
 int main(int argc, char *argv[])
 {
   if(argc != 3) {
-- 
1.9.1