Copied from Debian.
From: Jérémy Bobbio <lunar@debian.org>
Subject: Remove build date
Bug-Debian: http://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
"", ""