Remove/patch metadata timestamps for reproducibility.

diff -ur fpcbuild-3.0.0.old/fpcsrc/packages/fpmkunit/src/fpmkunit.pp fpcbuild-3.0.0/fpcsrc/packages/fpmkunit/src/fpmkunit.pp
--- fpcbuild-3.0.0.old/fpcsrc/packages/fpmkunit/src/fpmkunit.pp	2015-11-04 16:17:00.000000000 -0500
+++ fpcbuild-3.0.0/fpcsrc/packages/fpmkunit/src/fpmkunit.pp	2017-01-26 16:25:29.327339282 -0500
@@ -3779,7 +3779,7 @@
       Values[KeyName]:=Name;
       Values[KeyVersion]:=Version;
       // TODO Generate checksum based on PPUs
-      InstalledChecksum:=DateTimeToFileDate(Now);
+      InstalledChecksum:=0;
       Values[KeyChecksum]:=IntToStr(InstalledChecksum);
       Values[KeyCPU]:=CPUToString(ACPU);
       Values[KeyOS]:=OSToString(AOS);
diff -ur fpcbuild-3.0.0.old/fpcsrc/utils/fpcmkcfg/fpcmkcfg.pp fpcbuild-3.0.0/fpcsrc/utils/fpcmkcfg/fpcmkcfg.pp
--- fpcbuild-3.0.0.old/fpcsrc/utils/fpcmkcfg/fpcmkcfg.pp	2013-06-01 18:27:16.000000000 -0400
+++ fpcbuild-3.0.0/fpcsrc/utils/fpcmkcfg/fpcmkcfg.pp	2017-01-26 16:24:22.949044903 -0500
@@ -234,8 +234,8 @@
   TemplateParser.Values['FPCTARGETOS'] := BuildOSTarget;
   TemplateParser.Values['FPCBIN'] := 'fpc';
   TemplateParser.Values['PWD'] := GetCurrentDir;
-  TemplateParser.Values['BUILDDATE'] := DateToStr(Date);
-  TemplateParser.Values['BUILDTIME'] := TimeToStr(Time);
+  TemplateParser.Values['BUILDDATE'] := '';
+  TemplateParser.Values['BUILDTIME'] := '';
 
   TemplateParser.Values['LOCALREPOSITORY'] := GetDefaultLocalRepository;
   TemplateParser.Values['LOCALBASEPATH'] := GetDefaultLocalBasepath;
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<div class='path'>path: <a href='/guix/log/?id=755d494cbd9446628be3b255c1e2122bb547e9d2'>root</a>/<a href='/guix/log/gnu?id=755d494cbd9446628be3b255c1e2122bb547e9d2'>gnu</a>/<a href='/guix/log/gnu/packages?id=755d494cbd9446628be3b255c1e2122bb547e9d2'>packages</a>/<a href='/guix/log/gnu/packages/docbook.scm?id=755d494cbd9446628be3b255c1e2122bb547e9d2'>docbook.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/docbook.scm?id=755d494cbd9446628be3b255c1e2122bb547e9d2&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-03-27 19:48:43 -0400'>2021-03-27</span></td><td><a href='/guix/commit/gnu/packages/docbook.scm?id=69437a59e67634f85477a5eadab092598aa57ee1'>gnu: dblatex: Add 'dblatex/stable' variant.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/docbook.scm (dblatex/stable): New variable.
</span></span></td><td>Mark H Weaver</td></tr>
<tr><td><span title='2021-03-06 16:44:09 +0100'>2021-03-06</span></td><td><a href='/guix/commit/gnu/packages/docbook.scm?id=ade77dd0d3fec4950e89bbb59c69a5f1fe668c38'>gnu: Fix input typoes.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/crates-io.scm (rust-nettle-sys-2)[inputs]: Move ‘,’ to
its operand.
* gnu/packages/docbook.scm (docbook-dsssl)[native-inputs]: Likewise.
(docbook-dsssl-doc)[native-inputs]: Likewise.
* gnu/packages/emacs-xyz.scm (emacs-helm-slack)[propagated-inputs]:
Likewise.
* gnu/packages/kde-multimedia.scm (audiocd-kio)[inputs]: Likewise.
* gnu/packages/kde-pim.scm (akonadi-mime, kalarmcal, kcalendarsupport)
(keventviews, kmailtransport, kpimtextedit)[inputs]: Likewise.
* gnu/packages/mpd.scm (cantata)[inputs]: Likewise.
* gnu/packages/raspberry-pi.scm (bcm2835): Likewise.
* gnu/packages/samba.scm (samba)[native-inputs]: Likewise.
* gnu/packages/xdisorg.scm (dex)[inputs]: Likewise.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-01-14 09:24:50 -0500'>2021-01-14</span></td><td><a href='/guix/commit/gnu/packages/docbook.scm?id=2596099c257b0be5ad5cb24e98aaa1d73c3d7a55'>gnu: Add docbook-sgml-3.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/docbook.scm (docbook-sgml-3.1): New variable.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-01-14 09:24:50 -0500'>2021-01-14</span></td><td><a href='/guix/commit/gnu/packages/docbook.scm?id=81920e6d59de6d58afddb11d7acef357533f8440'>gnu: Add docbook-dsssl.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/docbook.scm (docbook-dsssl): New variable.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-01-14 09:24:49 -0500'>2021-01-14</span></td><td><a href='/guix/commit/gnu/packages/docbook.scm?id=14ac034dab923103b301d493440448e19b14d4bc'>gnu: Add docbook-sgml.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/docbook.scm (docbook-sgml): New variable.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-01-14 09:24:49 -0500'>2021-01-14</span></td><td><a href='/guix/commit/gnu/packages/docbook.scm?id=273cf0378d6ddfcf8b882decd796ad8f9699f343'>gnu: Add iso-8879-entities.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/docbook.scm (iso-8879-entities): New private variable.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2020-11-09 11:34:09 +0200'>2020-11-09</span></td><td><a href='/guix/commit/gnu/packages/docbook.scm?id=f7f92d8213961a8909f02d61fea6d135cfb449e4'>gnu: docbook: Update source URI.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/docbook.scm (docbook-xml-5)[source]: Update to new
source URI.
(docbook-xml, docbook-xml-4.4, docbook-xml-4.3, docbook-xml-4.2,
docbook-xml-4.1.2)[source]: Same.
</span></span></td><td>Efraim Flashner</td></tr>