Use faketime when generating dmg files

projects/tor-browser/config

@@ -22,6 +22,7 @@ targets:
         - unzip
         - python
         - bzip2
+        - faketime
   windows-i686:
     var:
       mar_osname: win32

projects/tor-browser/ddmg.sh

@@ -10,6 +10,9 @@ pushd [% src %]
 find . -type f | sed -e 's/^\.\///' | sort | xargs -i echo "{}={}" > [% filelist %]
 find . -type l | sed -e 's/^\.\///' | sort | xargs -i echo "{}={}" >> [% filelist %]
 
+export LD_PRELOAD=/usr/lib/faketime/libfaketime.so.1
+export FAKETIME="[% USE date; GET date.format(c('timestamp'), format = '%Y-%m-%d %H:%M:%S') %]"
+
 genisoimage -D -V "Tor Browser" -no-pad -R -apple -o "$dmg_tmpdir/tbb-uncompressed.dmg" -path-list [% filelist %] -graft-points -gid 20 -dir-mode 0755 -new-dir-mode 0755
 
 dmg dmg "$dmg_tmpdir/tbb-uncompressed.dmg" [% c('dmg_out', { error_if_undef => 1 }) %]