Start to record properties in 'patch_target_t'.
Start to record properties in 'patch_target_t'.

With this change, the patch code has knowledge of what properties we've
parsed but matching and applying those properties is not yet
implemented.

Tested by setting a breakpoint at patch.c:600 and inspecting
the content for added, deleted and modified properties.

* subversion/libsvn_client/patch.c
  (patch_target_t): Add fields 'prop_content_info' and 
    'prop_patched_paths'.
  (init_prop_content_info): New.
  (init_patch_target): Call init_prop_content_info() for each property.

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