OBS: switch to default pidgin-sipe.dsc
All current Debian-like platforms support telepathy so we no longer need
to use OS specific .dsc files but can use pidgin-sipe.dsc instead.
This doesn't fix Debian lintian failure though, because it fails to
parse the package name correctly:
[ 269s] Use of uninitialized value $n in string ne at
/usr/share/lintian/checks/fields.pm line 488.
[ 269s] Use of uninitialized value $n in concatenation (.) or string at
/usr/share/lintian/checks/fields.pm line 489.
[ 269s] E: pidgin-sipe source: source-field-does-not-match-pkg-name
pidgin-sipe !=
For now all Debian builds have been disabled on OBS.