gitian: Make linux boost dependency completely deterministic

It appears that the output was different every time.

This doesn't affect the final bitcoind/bitcoin-qt, but is confusing
nevertheless.

Fix it by using FAKETIME and zipping files in deterministic order.

contrib/gitian-descriptors/boost-linux.yml

@@ -20,11 +20,14 @@ files:
 script: |
   STAGING="$HOME/install"
   export LIBRARY_PATH="$STAGING/lib"
+  export LD_PRELOAD=/usr/lib/faketime/libfaketime.so.1
+  export FAKETIME=$REFERENCE_DATETIME
+  export TZ=UTC
   # Input Integrity Check
   echo "fff00023dd79486d444c8e29922f4072e1d451fc5a4d2b6075852ead7f2b7b52  boost_1_55_0.tar.bz2" | shasum -c
 
   mkdir -p "$STAGING"
-  tar xjf boost_1_55_0.tar.bz2
+  tar --warning=no-timestamp -xjf boost_1_55_0.tar.bz2
   cd boost_1_55_0
   GCCVERSION=$(g++ -E -dM $(mktemp --suffix=.h) | grep __VERSION__ | cut -d ' ' -f 3 | cut -d '"' -f 2)
   # note: bjam with -d+2 reveals that -O3 is implied by default, no need to provide it in cxxflags
@@ -38,6 +41,4 @@ script: |
   ./bjam toolset=gcc threadapi=pthread threading=multi variant=release link=static runtime-link=shared --user-config=user-config.jam --without-mpi --without-python -sNO_BZIP2=1 --layout=tagged --build-type=complete --prefix="$STAGING" $MAKEOPTS install
 
   cd "$STAGING"
-  export LD_PRELOAD=/usr/lib/faketime/libfaketime.so.1
-  export FAKETIME=$REFERENCE_DATETIME
-  zip -r $OUTDIR/boost-linux${GBUILD_BITS}-1.55.0-gitian-r1.zip *
+  find -type f | sort | zip -X@ $OUTDIR/boost-linux${GBUILD_BITS}-1.55.0-gitian-r1.zip

contrib/gitian-descriptors/deps-linux.yml

@@ -56,7 +56,7 @@ script: |
   cd qrencode-3.4.3
   unset FAKETIME # unset fake time during configure, as it does some clock sanity tests
   #   need --with-pic to avoid relocation error in 64 bit builds
-  ./configure --prefix=$STAGING --enable-static --disable-shared --with-pic --without-tools --disable-dependency-tracking --without-zlib
+  ./configure --prefix=$STAGING --enable-static --disable-shared --with-pic --without-tools --disable-dependency-tracking
   # Workaround to prevent re-configuring by make; make all files have a date in the past
   find . -print0 | xargs -r0 touch -t 200001010000
   export FAKETIME=$REFERENCE_DATETIME
@@ -68,7 +68,7 @@ script: |
   mkdir -p $STAGING/host/bin
   unset FAKETIME # unset fake time during configure, as it does some clock sanity tests
   #   need --with-pic to avoid relocation error in 64 bit builds
-  ./configure --prefix=$STAGING --bindir=$STAGING/host/bin --enable-static --disable-shared --with-pic
+  ./configure --prefix=$STAGING --bindir=$STAGING/host/bin --enable-static --disable-shared --with-pic --without-zlib
   # Workaround to prevent re-configuring by make; make all files have a date in the past
   find . -print0 | xargs -r0 touch -t 200001010000
   export FAKETIME=$REFERENCE_DATETIME