[PATCH] Fix issue #4049 - SEGV on patch that deletes and skips

Hi,

It's been a year since my last commit and I've forgotten about the
internals of the patch code. Sending this patch for review so that I
don't mess something up.

[[[
Fix issue #4049 - SEGV on patch that deletes and skips.

When we do the sanity check of the supplied patch file we set
skipped=TRUE for the files that we're not going to process.

* subversion/libsvn_client/patch.c
  (patch_target_info_t): Add SKIPPED field.
  (delete_empty_dirs): Don't process targets that are marked skipped.

* subversion/tests/cmdline/patch_tests.py
  (patch_delete_and_skip): New.
  (test_list): Add new test.
]]]

I could have checked if local_abspath was NULL but I figured it might be
easy to forget to set local_abspath = NULL in one of the many places
were we set the skipped flag.

--
Daniel (dannas)