Merge branch 'jc/directory-attrs-regression-fix' into maint-1.8.1

Merge branch 'jc/directory-attrs-regression-fix' into maint-1.8.1

A pattern "dir" (without trailing slash) in the attributes file
stopped matching a directory "dir" by mistake with an earlier change
that wanted to allow pattern "dir/" to also match.

* jc/directory-attrs-regression-fix:
  t: check that a pattern without trailing slash matches a directory
  dir.c::match_pathname(): pay attention to the length of string parameters
  dir.c::match_pathname(): adjust patternlen when shifting pattern
  dir.c::match_basename(): pay attention to the length of string parameters
  attr.c::path_matches(): special case paths that end with a slash
  attr.c::path_matches(): the basename is part of the pathname