Fix Linux gitian descriptor to use QRCode support.

contrib/gitian-descriptors/gitian.yml

@@ -16,7 +16,7 @@ packages:
 - "libssl-dev"
 - "git-core"
 - "unzip"
-- "qrencode"
+- "libqrencode-dev"
 reference_datetime: "2011-01-30 00:00:00"
 remotes:
 - "url": "https://github.com/bitcoin/bitcoin.git"
@@ -44,6 +44,6 @@ script: |
   mkdir -p $OUTDIR/bin/$GBUILD_BITS
   install -s bitcoind $OUTDIR/bin/$GBUILD_BITS
   cd ..
-  qmake INCLUDEPATH="$INSTDIR/include" LIBS="-L$INSTDIR/lib" RELEASE=1 USE_SSL=1
+  qmake INCLUDEPATH="$INSTDIR/include" LIBS="-L$INSTDIR/lib" RELEASE=1 USE_SSL=1 USE_QRCODE=1
   make $MAKEOPTS
   install bitcoin-qt $OUTDIR/bin/$GBUILD_BITS