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=554bf4f6062713901af01878bce23530fdebed17'>root</a>/<a href='/guix/log/gnu?id=554bf4f6062713901af01878bce23530fdebed17'>gnu</a>/<a href='/guix/log/gnu/system?id=554bf4f6062713901af01878bce23530fdebed17'>system</a>/<a href='/guix/log/gnu/system/linux-container.scm?id=554bf4f6062713901af01878bce23530fdebed17'>linux-container.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/system/linux-container.scm?id=554bf4f6062713901af01878bce23530fdebed17&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2017-02-03 00:23:28 +0100'>2017-02-03</span></td><td><a href='/guix/commit/gnu/system/linux-container.scm?id=d2a5e6982ddcbe1e5479bda62a72b3a94570855a'>file-systems: Add 'file-system-mapping-&gt;bind-mount'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/system/file-systems.scm (file-system-mapping-&gt;bind-mount): New
procedure.
* gnu/system/linux-container.scm (mapping-&gt;file-system): Remove.
(containerized-operating-system)[mapping-&gt;fs]: Use
'file-system-mapping-&gt;bind-mount' instead of 'mapping-&gt;file-system'.
* guix/scripts/environment.scm (launch-environment/container): Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-11-10 18:01:44 +0100'>2016-11-10</span></td><td><a href='/guix/commit/gnu/system/linux-container.scm