Fixed gcc function is not a prototype warnings

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@2121 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/pjlib/include/pj/pool.h b/pjlib/include/pj/pool.h
index 14d0fc8..e8fa943 100644
--- a/pjlib/include/pj/pool.h
+++ b/pjlib/include/pj/pool.h
@@ -622,7 +622,7 @@
 /**
  * Get #PJ_NO_MEMORY_EXCEPTION constant.
  */ 
-PJ_DECL(int) pj_NO_MEMORY_EXCEPTION();
+PJ_DECL(int) pj_NO_MEMORY_EXCEPTION(void);
 
 /**
  * This global variable points to default memory pool factory policy.