Dpkg::Vendor::Debian: Enable timeless build flag feature by default

Closes: #805872
Signed-off-by: Guillem Jover <guillem@debian.org>

debian/changelog

@@ -31,6 +31,8 @@ dpkg (1.18.4) UNRELEASED; urgency=medium
   * Fix usage of dpkg-architecture -s after other action options.
     Reported by Niels Thykier <niels@thykier.net>.
   * Add NIOS2 support to cputable. Thanks to Marek Vasut <marex@denx.de>.
+  * On Debian and derivatives enable timeless build flag feature by default.
+    Thanks to Paul Wise <pabs@debian.org>. Closes: #805872
   * Test suite:
     - Improve perl code test coverage.
   * Build system:

man/dpkg-buildflags.1

@@ -369,7 +369,7 @@ compilation. Except as noted below, these are enabled by default for
 architectures that support them.
 .TP
 .B timeless
-This setting (disabled by default) adds
+This setting (enabled by default) adds
 .B \-Wdate\-time
 to \fBCPPFLAGS\fP.
 This will cause warnings when the \fB__TIME__\fP, \fB__DATE__\fP and

scripts/Dpkg/Vendor/Debian.pm

@@ -157,7 +157,7 @@ sub _add_reproducible_flags {
 
     # Default feature states.
     my %use_feature = (
-        timeless => 0,
+        timeless => 1,
     );
 
     # Adjust features based on user or maintainer's desires.