* acinclude.m4 (LIBGFOR_CHECK_UNLINK_OPEN_FILE): Add check to see
if target can unlink open files.
* configure.ac: Use this new test.
* config.h.in: Regenerate.
* configure: Regenerate.
* Makefile.in: Regenerate.
* aclocal.ac: Regenerate.
* io/io.h: Add prototype for unpack_filename.
* io/close.c (st_close): Delete file after closing unit if
HAVE_UNLINK_OPEN_FILE is not defined.
* io/unix.c (unpack_filename): Unlink scratch file after opening
it only if HAVE_UNLINK_OPEN_FILE is defined.
From-SVN: r103566
