Make parse-diff.c compile with VC6 by including limits.h for ULONG_MAX.
Make parse-diff.c compile with VC6 by including limits.h for ULONG_MAX.

* subversion/libsvn_diff/parse-diff.c
 add include for limits.h to make sure ULONG_MAX defined

Approved by: brane

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion