[Freewx-maint] Bug#821934: Need libwxgtk-webview3.0-dev as build-dep

[Scott Talbert]

>From control:

Build-Depends:
     debhelper (>= 9),
     dh-python,
     libgtk2.0-dev,
     libwxgtk3.0-dev,
     libwxgtk-media3.0-dev,
#    libwxgtk-webview3.0-dev,
     python-all,
     python-all-dev

Uncommenting the appears to be all that is needed.