[EXTERNAL] [RFC v3 3/3] examples: add lcore topology API calls

[Pavan Nikhilesh Bhagavatula]

> Enhance example code to allow topology based lcores API, while
> retaining default behaviour.
> 
>  - helloworld: allow lcoes to send hello to lcores in selected topology.
>  - l2fwd: allow use of IO lcores topology.
>  - skeleton: choose the lcore from IO topology which has more ports.
> 
> v3 changes:
>  - fix typo from SE_NO_TOPOLOGY to USE_NO_TOPOLOGY
> 
> Signed-off-by: Vipin Varghese <vipin.varghese at amd.com>
> ---

I see compilation failure on ARM platforms due to missing header include.

../examples/helloworld/main.c: In function 'parse_topology':
../examples/helloworld/main.c:83:13: error: implicit declaration of function 'strtoul'; did you mean 'strtok'? [-Wimplicit-function-declaration]
   83 |         n = strtoul(q_arg, &end, 10);
      |             ^~~~~~~
      |             strtok
../examples/helloworld/main.c:83:13: warning: nested extern declaration of 'strtoul' [-Wnested-externs]
../examples/helloworld/main.c: In function 'helloworld_parse_args':
../examples/helloworld/main.c:115:42: error: 'EXIT_FAILURE' undeclared (first use in this function)
  115 |                                 rte_exit(EXIT_FAILURE, "Invalid Topology selection\n");
      |                                          ^~~~~~~~~~~~
../examples/helloworld/main.c:13:1: note: 'EXIT_FAILURE' is defined in header '<stdlib.h>'; this is probably fixable by adding '#include <stdlib.h>'
   12 | #include <rte_memory.h>
  +++ |+#include <stdlib.h>
   13 | #include <rte_launch.h>
../examples/helloworld/main.c:115:42: note: each undeclared identifier is reported only once for each function it appears in
  115 |                                 rte_exit(EXIT_FAILURE, "Invalid Topology selection\n");
      |                                          ^~~~~~~~~~~~
../examples/helloworld/main.c: In function 'main':
../examples/helloworld/main.c:153:26: error: 'EXIT_FAILURE' undeclared (first use in this function)
  153 |                 rte_exit(EXIT_FAILURE, "Invalid arguments\n");
      |                          ^~~~~~~~~~~~
../examples/helloworld/main.c:153:26: note: 'EXIT_FAILURE' is defined in header '<stdlib.h>'; thi

Below header include should fix it.

diff --git a/examples/helloworld/main.c b/examples/helloworld/main.c
index 9845c3775c3a..f49bd0108f74 100644
--- a/examples/helloworld/main.c
+++ b/examples/helloworld/main.c
@@ -3,6 +3,7 @@
  */
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <stdint.h>
 #include <errno.h>