pipeline: fix missing header includes

The stdio.h header needs to be included to get the definition of the
FILE type.

Fixes: b32c0a2c5e ("pipeline: add SWX table update high level API")
Fixes: 3ca60ceed7 ("pipeline: add SWX pipeline specification file")
Cc: stable@dpdk.org

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Reviewed-by: David Marchand <david.marchand@redhat.com>

lib/librte_pipeline/rte_swx_ctl.h

@@ -15,6 +15,7 @@ extern "C" {
 
 #include <stddef.h>
 #include <stdint.h>
+#include <stdio.h>
 
 #include <rte_compat.h>
 

lib/librte_pipeline/rte_swx_pipeline.h

@@ -15,6 +15,7 @@ extern "C" {
 
 #include <stddef.h>
 #include <stdint.h>
+#include <stdio.h>
 
 #include <rte_compat.h>