Bug#790519: texinfo: update-info-dir should ignore also jpg files

[Norbert Preining <preining@logic.at>]

Package: texinfo
Version: 6.0.0.dfsg.1-2
Severity: normal

install-info: warning: no info dir entry in `/usr/share/info/lilypond/pictures/darius-blasband.jpg'
install-info: warning: no info dir entry in `/usr/share/info/lilypond/pictures/ross-beam-scan.jpg'
install-info: warning: no info dir entry in `/usr/share/info/lilypond/pictures/carter-brey.jpg'
install-info: warning: no info dir entry in `/usr/share/info/lilypond/pictures/orm-finnendahl.jpg'


we already skip .png file in update-info-dir, but not jpg file:
  case $file in
    */dir|*/dir.gz|*/dir.old|*/dir.old.gz|*-[0-9]|*-[0-9].gz|*-[1-9][0-9]|*-[1-9][0-9].gz|*.png)
    # these files are ignored
    continue
    ;;



-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (200, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.0.0-2-amd64 (SMP w/8 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 texinfo depends on:
ii  libintl-perl            1.23-1
ii  libtext-unidecode-perl  1.22-1
ii  libxml-libxml-perl      2.0116+dfsg-4

texinfo recommends no packages.

Versions of packages texinfo suggests:
ii  texinfo-doc-nonfree          6.0.0-1
ii  texlive-base                 2015.20150625-1
ii  texlive-generic-recommended  2015.20150625-1
ii  texlive-latex-base           2015.20150625-1

-- no debconf information