pathspec: add match_leading_pathspec variant

The do_match_pathspec() function has the DO_MATCH_LEADING_PATHSPEC
option to allow pathspecs to match when matching "src" against a
pathspec like "src/path/...". This support is not exposed by
match_pathspec, and the internal flags to do_match_pathspec are not
exposed outside of dir.c

The upcoming support for pathspecs in git diff --no-index need the
LEADING matching behavior when iterating down through a directory with
readdir.

We could try to expose the match_pathspec_with_flags to the public API.
However, DO_MATCH_EXCLUDES really shouldn't be public, and its a bit
weird to only have a few of the flags become public.

Instead, add match_leading_pathspec() as a function which sets both
DO_MATCH_DIRECTORY and DO_MATCH_LEADING_PATHSPEC when is_dir is true.

This will be used in a following change to support pathspec matching in
git diff --no-index.

Signed-off-by: Jacob Keller <jacob.keller@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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