[PATCH] librte_hash: Fix compile errors on IBM POWER

[Chao Zhu <chaozhu@linux.vnet.ibm.com>]

This patch fixes the compile errors caused by lacking of "size_t" definition in rte_hash.h. The
compile error exists on IBM POWER and ARM (see jerin.jacob@caviumnetworks.com's message).

The errors are like:
In file included from /tmp/dpdk/app/test/test_hash_scaling.c:35:0:
/tmp/dpdk/build/include/rte_hash.h:70:70: error: unknown type name ‘size_t’
 typedef int (*rte_hash_cmp_eq_t)(const void *key1, const void *key2, size_t key_len);
                                                                      ^
/tmp/dpdk/build/include/rte_hash.h:120:48: error: unknown type name ‘rte_hash_cmp_eq_t’
 void rte_hash_set_cmp_func(struct rte_hash *h, rte_hash_cmp_eq_t func);

Signed-off-by: Chao Zhu <chaozhu@linux.vnet.ibm.com>
---
 lib/librte_hash/rte_hash.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/lib/librte_hash/rte_hash.h b/lib/librte_hash/rte_hash.h
index 6494ade..85fc416 100644
--- a/lib/librte_hash/rte_hash.h
+++ b/lib/librte_hash/rte_hash.h
@@ -41,6 +41,7 @@
  */
 
 #include <stdint.h>
+#include <stddef.h>
 
 #ifdef __cplusplus
 extern "C" {
-- 
1.7.1