gitian: make linux qt intermediate deterministic

A qt installation date snuck into the host utils (lrelease etc)
This doesn't affect the end product, so no dependency version bump.

It also doesn't explain why gavin's and mine build is different

contrib/gitian-descriptors/qt-linux.yml

@@ -40,6 +40,7 @@ script: |
   tar xzf qt-everywhere-opensource-src-4.6.4.tar.gz
   cd qt-everywhere-opensource-src-4.6.4
   QTBUILDDIR=$(pwd)
+  sed 's/TODAY=`date +%Y-%m-%d`/TODAY=2011-01-30/' -i configure
 
   # Need to build 4.6-versioned host utilities as well (lrelease/qrc/lupdate/...)
   ./configure -prefix $INSTALLPREFIX -confirm-license -release -opensource -no-qt3support -no-multimedia -no-audio-backend -no-phonon -no-phonon-backend -no-declarative -no-script -no-scripttools -no-javascript-jit -no-webkit -no-svg -no-xmlpatterns -no-sql-sqlite -no-nis -no-cups -no-iconv -no-dbus -no-gif -no-libtiff -no-opengl -nomake examples -nomake demos -nomake docs

doc/release-process.md

@@ -93,8 +93,8 @@ Release Process
     571789867d172500fa96d63d0ba8c5b1e1a3d6f44f720eddf2f93665affc88b3  bitcoin-deps-linux64-gitian-r5.zip
     f29b7d9577417333fb56e023c2977f5726a7c297f320b175a4108cf7cd4c2d29  boost-linux32-1.55.0-gitian-r1.zip
     88232451c4104f7eb16e469ac6474fd1231bd485687253f7b2bdf46c0781d535  boost-linux64-1.55.0-gitian-r1.zip
-    74ec2d301cf1a9d03b194153f545102ba45dad02b390485212fe6717de486361  qt-linux32-4.6.4-gitian-r1.tar.gz
-    01d0477e299467f09280f15424781154e2b1ea4072c5edb16e044c234954fd9a  qt-linux64-4.6.4-gitian-r1.tar.gz
+    57e57dbdadc818cd270e7e00500a5e1085b3bcbdef69a885f0fb7573a8d987e1  qt-linux32-4.6.4-gitian-r1.tar.gz
+    60eb4b9c5779580b7d66529efa5b2836ba1a70edde2a0f3f696d647906a826be  qt-linux64-4.6.4-gitian-r1.tar.gz
     60dc2d3b61e9c7d5dbe2f90d5955772ad748a47918ff2d8b74e8db9b1b91c909  boost-win32-1.55.0-gitian-r6.zip
     f65fcaf346bc7b73bc8db3a8614f4f6bee2f61fcbe495e9881133a7c2612a167  boost-win64-1.55.0-gitian-r6.zip
     97e62002d338885336bb24e7cbb9471491294bd8857af7a83d18c0961f864ec0  bitcoin-deps-win32-gitian-r11.zip