debian/control: drop needless libdbus-glib-1-dev

As libdbus-glib-1-dev is deprecated in Bug#895291 [1], and dbus-glib
is not used at all, so it was removed from debian/control.
This commit fixes Bug#955840 unnecessarily Build-Depends on deprecated
dbus-glib. [2]

[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=895291
[2] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=955840

debian/control

@@ -14,7 +14,6 @@ Build-Depends:
  libavcodec-dev,
  libavutil-dev,
  libcups2-dev,
- libdbus-glib-1-dev,
  libgsm1-dev,
  libgstreamer-plugins-base1.0-dev,
  libgstreamer1.0-dev,