unzip: remove build timestamp

Build timestamps prevent reproducible builds [0].
Thanks to debian for the patch.

[0] https://reproducible-builds.org/docs/timestamps/

Signed-off-by: Alexander Couzens <lynxis@fe80.eu>

utils/unzip/patches/010-remove-build-date.patch

@@ -0,0 +1,17 @@
+From: Jérémy Bobbio <lunar@debian.org>
+Subject: Remove build date
+Bug-Debian: https://bugs.debian.org/782851
+ In order to make unzip build reproducibly, we remove the
+ (already optional) build date from the binary.
+
+--- a/unix/unix.c
++++ b/unix/unix.c
+@@ -1705,7 +1705,7 @@
+ #endif /* Sun */
+ #endif /* SGI */
+ 
+-#ifdef __DATE__
++#if 0
+       " on ", __DATE__
+ #else
+       "", ""