For those of us with somewhat deficient compilers that don't provide ULONG_MAX
unless <limits.h> is explicitly included.

 * subversion/include/svn_types.h
   (includes): Add include of limits.h
   
Approved by: stsp


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1461920 13f79535-47bb-0310-9956-ffa450edef68