gnu: mpv: Remove 'samba' input.

This is a heavy-weight and uncommon feature.  See
<http://lists.gnu.org/archive/html/guix-devel/2015-12/msg00701.html>.

* gnu/packages/video.scm (mpv)[inputs]: Remove 'samba'.

gnu/packages/video.scm

@@ -66,7 +66,6 @@ (define-module (gnu packages video)
   #:use-module (gnu packages pulseaudio)
   #:use-module (gnu packages python)
   #:use-module (gnu packages qt)
-  #:use-module (gnu packages samba)
   #:use-module (gnu packages sdl)
   #:use-module (gnu packages ssh)
   #:use-module (gnu packages texinfo)
@@ -736,7 +735,6 @@ (define-public mpv
        ("mpg123" ,mpg123)
        ("pulseaudio" ,pulseaudio)
        ("rsound" ,rsound)
-       ("samba" ,samba)
        ("vapoursynth" ,vapoursynth)
        ("waf" ,(origin
                  (method url-fetch)