the source package is xorg-server

changing this would break a ton of autopkgtests that use xvfb-run which
now get errors like:

testsuite            FAIL stderr: QStandardPaths: XDG_RUNTIME_DIR not set, 
defaulting to 
             '/tmp/runtime-ubuntu'

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https://bugs.launchpad.net/bugs/1059947

Title:
  xvfb-run munges stdout and stderr together

Status in xorg-server package in Ubuntu:
  Confirmed

Bug description:
  It executes the supplied command thusly:
  DISPLAY=:$SERVERNUM XAUTHORITY=$AUTHFILE "$@" 2>&1

  This should be
  DISPLAY=:$SERVERNUM XAUTHORITY=$AUTHFILE "$@"

  Leaving the caller to redirect stderr to stdout, or to supply a single
  fd at their discretion. The side effect of munging the two fd's
  together is that programs which provide structured data on stdout have
  their output streams corrupted if they, or any subprocesses they have,
  happen to write to stderr at an inopportune time.

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