Bug#827173: gcc-6: missing "Debian" in "gcc-6 --version" output

[Vincent Lefevre <vincent@vinc17.net>]

Package: gcc-6
Version: 6.1.1-6
Severity: minor

$ gcc-6 --version
gcc-6 ( 6.1.1-6) 6.1.1 20160609
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

The first line of the output should have been:

gcc-6 (Debian 6.1.1-6) 6.1.1 20160609

There was no such problem with gcc-6 6.1.1-5.

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'stable-updates'), (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.6.0-1-amd64 (SMP w/12 CPU cores)
Locale: LANG=POSIX, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages gcc-6 depends on:
ii  binutils      2.26-11
ii  cpp-6         6.1.1-6
ii  gcc-6-base    6.1.1-6
ii  libc6         2.22-11
ii  libcc1-0      6.1.1-6
ii  libgcc-6-dev  6.1.1-6
ii  libgcc1       1:6.1.1-6
ii  libgmp10      2:6.1.0+dfsg-2
ii  libisl15      0.17.1-1
ii  libmpc3       1.0.3-1
ii  libmpfr4      3.1.4-2
ii  libstdc++6    6.1.1-6
ii  zlib1g        1:1.2.8.dfsg-2+b1

Versions of packages gcc-6 recommends:
ii  libc6-dev  2.22-11

Versions of packages gcc-6 suggests:
ii  gcc-6-doc         6.1.0-1
ii  gcc-6-locales     6.1.1-6
ii  gcc-6-multilib    6.1.1-6
pn  libasan3-dbg      <none>
pn  libatomic1-dbg    <none>
pn  libcilkrts5-dbg   <none>
pn  libgcc1-dbg       <none>
pn  libgomp1-dbg      <none>
pn  libitm1-dbg       <none>
pn  liblsan0-dbg      <none>
pn  libmpx2-dbg       <none>
pn  libquadmath0-dbg  <none>
pn  libtsan0-dbg      <none>
pn  libubsan0-dbg     <none>

-- no debconf information