Add missing dependency to dev package".

Approved by PS Jenkins bot, Sebastien Bacher.

Author: pete-woods

debian/control

@@ -28,6 +28,7 @@ Section: libdevel
 Architecture: any
 Multi-Arch: same
 Depends: libunityvoice1 (= ${binary:Version}),
+         qtbase5-dev,
          ${misc:Depends},
 Description: client library for Unity voice service
  This package contains files that are needed to build applications.