Merge branch 'jc/whitespace-incomplete-line'

It does not make much sense to apply the "incomplete-line"
whitespace rule to symbolic links, whose contents almost always
lack the final newline.  "git apply" and "git diff" are now taught
to exclude them for a change to symbolic links.

* jc/whitespace-incomplete-line:
  whitespace: symbolic links usually lack LF at the end

diff --cc apply.c
Simple merge

diff --cc diff.c
Simple merge