debian/control: drop needless dependency to dbus-glib

Kentaro Hayashirequested to merge
kenhys/enchant:drop-libdbus-glib into master

As libdbus-glib-1-dev is deprecated in Bug#895291 [1], so it was removed from debian/control. This commit fixes Bug#955834 unnecessarily Build-Depends on deprecated dbus-glib. [2]

As smcv mentions 955834#5, dbus-glib is used for zemberek feature, but it is explicitly disabled in debian/rules so it doesn't affect to build enchant package.

[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=895291 [2] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=955834

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