zip: Fix build with gcc-14

zip's configure fails to link this piece of test code:

  int main() { return closedir(opendir(".")); }

with GCC-14 because it now treats implicit declaration of function
as error, unline older GCC version where it was just a warning
and this test would build fine.

Remove 0002-unix.c-Do-not-redefine-DIR-as-FILE.patch which
is now unnecessary.

Signed-off-by: Zoltán Böszörményi <zboszor@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 3422411e)
Signed-off-by: Steve Sakoman <steve@sakoman.com>