zip: remove build timestamp

Build timestamps prevents 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/zip/Makefile

@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 PKG_NAME:=zip
 PKG_REV:=30
 PKG_VERSION:=3.0
-PKG_RELEASE:=3
+PKG_RELEASE:=4
 
 PKG_SOURCE:=$(PKG_NAME)$(PKG_REV).tar.gz
 PKG_SOURCE_URL:=@SF/infozip

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

@@ -0,0 +1,15 @@
+From: Santiago Vila <sanvila@debian.org>
+Subject: Remove (optional) build date to make the build reproducible
+Bug-Debian: http://bugs.debian.org/779042
+
+--- a/unix/unix.c
++++ b/unix/unix.c
+@@ -1020,7 +1020,7 @@
+ 
+ 
+ /* Define the compile date string */
+-#ifdef __DATE__
++#if 0
+ #  define COMPILE_DATE " on " __DATE__
+ #else
+ #  define COMPILE_DATE ""