(FNM_CASEFOLD, FNM_LEADING_DIR): Define to 0 if not defined (e.g., a pure POSIX system). (EXCLUDE_macros_do_not_collide_with_FNM_macros): Use FNM_PATHNAME instead of FNM_FILE_NAME, for compatibility with pure POSIX sytems.

The files in this directory are used in many GNU packages,
including diffutils, fileutils, sh-utils, tar, and textutils.
The autoconf tests required for these files are in ../m4.