triton: make mempool.h self-contained even when MEMDEBUG is defined

If MEMDEBUG is defined, then we need to include "memdebug.h" to define
'md_free'.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

accel-pppd/triton/mempool.h

@@ -15,6 +15,8 @@ mempool_t *mempool_create2(int size);
 struct mempool_stat_t mempool_get_stat(void);
 
 #ifdef MEMDEBUG
+#include "memdebug.h"
+
 void *md_mempool_alloc(mempool_t*, const char *fname, int line);
 #define mempool_alloc(pool) md_mempool_alloc(pool, __FILE__, __LINE__)
 #define mempool_free(ptr) md_free(ptr, __FILE__, __LINE__)