Drop build date from generated file

Bernhard M. Wiedemannrequested to merge
bmwiedemann/ntpsec:datev2 into master

This is an alternative to !1499 (closed) that reduces the code.

Drop build date from generated file to make builds reproducible. See https://reproducible-builds.org/ for why this is good.

This patch was done while working on reproducible builds for openSUSE.

Without this patch, openSUSE's ntpsec-debugsource-1.2.4-1.4.x86_64.rpm had such variations:

--- old//usr/src/debug/ntpsec-1.2.4/build/host/ntpd/ntp_keyword.h       2025-11-21 14:13:17.000000000 +0000
+++ new//usr/src/debug/ntpsec-1.2.4/build/host/ntpd/ntp_keyword.h       2025-11-21 14:13:17.000000000 +0000
@@ -2,7 +2,7 @@
  * ntp_keyword.h
  * 
  * NOTE: edit this file with caution, it is generated by keyword-gen.c
- *      Generated 2026-05-01 09:01:38 UTC        diff_ignore_line
+ *      Generated 2026-05-05 09:41:49 UTC        diff_ignore_line
  *
  */
 #include "ntp_scanner.h"

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