tst-freopen4: Remove temporary directory from warning message

tst-freopen4: Remove temporary directory from warning message

tst-freopen4-main.c issues a warning message:

warning: could not remove temporary file: /tmp/tst-freopen4potgti: No such file or directory

since chroot makes generated temporary directories inaccessible.  Add
special rules for tst-freopen4.out and tst-freopen64-4.out to remove
the temporary directory in warning message from tst-freopen4 and
tst-freopen64-4.

This partially fixes BZ #33182.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Reviewed-by: Sam James <sam@gentoo.org>