Bug#823110: cups-filters: Versioned dependency on imagemagick makes using graphicsmagick harder

[Yuri D'Elia <wavexx@thregr.org>]

Package: cups-filters
Version: 1.11.6-3
Followup-For: Bug #823110

I second this, and push it further.
cups-filters depends on imagemagik for "convert" alone, and it's used only in:

 /var/lib/cups/filter/imagetobrf
 /var/lib/cups/filter/texttobrf

Both usage of convert are absolutely trivial, and graphicsmagick can fulfil
both without problems.

I originally filed a bug to downgrade the dependency of braille-dependent tools
to a Recommends.

Please change the dependency to:

 Recommends: imagemagick (>= 6.4~) | graphicsmagick-imagemagick-compat

Please note that I do not want to dismiss braille support here. I'd rather see
braille filters split into a separate package where we can properly Depend on
the required tools instead.

-- System Information:
Debian Release: 9.0
 APT prefers unstable
 APT policy: (900, 'unstable'), (800, 'experimental')
Architecture: amd64
(x86_64)

Kernel: Linux 4.11.0-trunk-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, 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 cups-filters depends on:
ii  bc                               1.06.95-9+b3
ii  cups-filters-core-drivers        1.11.6-3
ii  ghostscript                      9.20~dfsg-3.2
ii  imagemagick                      8:6.9.7.4+dfsg-9
ii  imagemagick-6.q16 [imagemagick]  8:6.9.7.4+dfsg-9
ii  libc6                            2.24-10
ii  libcups2                         2.2.1-8
ii  libcupsfilters1                  1.11.6-3
ii  libcupsimage2                    2.2.1-8
ii  libfontconfig1                   2.12.1-0.1
ii  libfontembed1                    1.11.6-3
ii  libgcc1                          1:6.3.0-18
ii  libijs-0.35                      0.35-12
ii  libpoppler64                     0.48.0-2
ii  libqpdf17                        6.0.0-2
ii  libstdc++6                       6.3.0-18
ii  poppler-utils                    0.48.0-2

Versions of packages cups-filters recommends:
ii  colord                            1.3.3-2
pn  liblouisutdml-bin | liblouis-bin  <none>

Versions of packages cups-filters suggests:
pn  antiword                                   <none>
pn  docx2txt                                   <none>
pn  foomatic-db-compressed-ppds | foomatic-db  <none>

-- Configuration Files:
/etc/modules-load.d/cups-filters.conf [Errno 2] No such file or directory: '/etc/modules-load.d/cups-filters.conf'