Fix various build issues.

* subversion/include/private/svn_object_pool.h
  (): terminate last line with a newline

* subversion/libsvn_repos/authz_pool.c
  subversion/libsvn_repos/config_pool.c
  subversion/libsvn_repos/repos_pool.c
  (): #include APR backward compat header

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1540596 13f79535-47bb-0310-9956-ffa450edef68