Silence dpkg-query errors in install-build-deps.

build/install-build-deps.sh

 #!/bin/bash -e
 
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Script to install everything needed to build chromium (well, ideally, anyway)
 # See https://chromium.googlesource.com/chromium/src/+/master/docs/linux_build_instructions.md
 
 usage() {
@@ skipping 164 matching lines @@
            ${naclports_list}"
 
 # Find the proper version of packages that depend on mesa. Only one -lts variant
 # of mesa can be installed and everything that depends on it must match.
 
 # Query for the name and status of all mesa LTS variants, filter for only
 # installed packages, extract just the name, and eliminate duplicates (there can
 # be more than one with the same name in the case of multiarch). Expand into an
 # array.
 mesa_packages=($(dpkg-query -Wf'${package} ${status}\n' \
-                            libgl1-mesa-glx-lts-\* | \
+                            libgl1-mesa-glx-lts-\* 2>/dev/null | \
                  grep " ok installed" | cut -d " " -f 1 | sort -u))
 if [ "${#mesa_packages[@]}" -eq 0 ]; then
   mesa_variant=""
 elif [ "${#mesa_packages[@]}" -eq 1 ]; then
   # Strip the base package name and leave just "-lts-whatever"
   mesa_variant="${mesa_packages[0]#libgl1-mesa-glx}"
 else
   echo "ERROR: unable to determine which libgl1-mesa-glx variant is installed."
   exit 1
 fi
@@ skipping 275 matching lines @@
   # only contains libcrypto.so.1.0.0 and not the symlink needed for
   # linking (libcrypto.so).
   create_library_symlink /lib/i386-linux-gnu/libcrypto.so.1.0.0 \
       /usr/lib/i386-linux-gnu/libcrypto.so
 
   create_library_symlink /lib/i386-linux-gnu/libssl.so.1.0.0 \
       /usr/lib/i386-linux-gnu/libssl.so
 else
   echo "Skipping symbolic links for NaCl."
 fi