Fix build warning.
Fix build warning.

* test/test_all.c
  (global): include stdlib.h for its exit() and atexit() declarations.



git-svn-id: 683495cb1553624b05a54e2ba9533425f69cf277@1144 61a7d7f5-40b7-0310-9c16-bb0ea8cb1845

coapp-packages/serf,coapp-packages/serf,coapp-packages/serf