pkg_create_dbgsym doesn't cope with multi-line Depends, Suggests, etc.

Binary package hint: pkg-create-dbgsym

The mplayer build fails during the creation of the -dbgsym packages with the following error:

pkg-gencontrol: warning: unknown substitution variable ${shlibs:Depends}
dpkg-gencontrol: warning: unknown substitution variable ${misc:Depends}
dpkg-gencontrol: warning: unknown substitution variable ${shlibs:Depends}
dpkg-gencontrol: warning: unknown substitution variable ${misc:Depends}
dpkg-gencontrol: internal error: field Section has blank lines >video
   ttf-freefont,
   netselect | fping,
   bzip2,
   fontconfig
  ,

   mplayer-doc (<< 1.0~rc3+svn20090426-1)<
Error: parsed ddeb section or priority is empty

(http://launchpadlibrarian.net/27618143/buildlog_ubuntu-karmic-i386.mplayer_2%3A1.0~rc3%2Bsvn20090426-1ubuntu1_FAILEDTOBUILD.txt.gz)

After a look at the pkg_create_dbgsym code this happens because it doesn't filter out multi-line Depends, Suggests, etc. properly.

An example from mplayer's debian/control:

Package: mplayer-nogui
Architecture: any
Section: video
Suggests: mplayer-doc,
          ttf-freefont,
          netselect | fping,
          bzip2,
          fontconfig
Depends: debconf | debconf-2.0,
         ${shlibs:Depends},
         ${misc:Depends}
Replaces: mplayer (<< 1.0~rc3+svn20090426-1),
          mplayer-doc (<< 1.0~rc3+svn20090426-1)
Description: movie player for Unix-like systems
 MPlayer plays most MPEG, VOB, AVI, Ogg/OGM, VIVO,
 [...]

Calling "perl -p000 -e 's/^(?:Pre-Depends|Depends|Recommends|Suggests|Conflicts|Provides|Replaces|Breaks|Essential):.*?\n(?! )//msg' debian/control" (taken from pkg_create_dbgsym) results in:

Package: mplayer-nogui
Architecture: any
Section: video
   ttf-freefont,
   netselect | fping,
   bzip2,
   fontconfig
  ${shlibs:Depends},
  ${misc:Depends}
   mplayer-doc (<< 1.0~rc3+svn20090426-1)
Description: movie player for Unix-like systems
 MPlayer plays most MPEG, VOB, AVI, Ogg/OGM, VIVO,
 [...]