Remove generated .spec file

Likely extremely bitrotten, and we should not ship this anyway.

gst-libav.spec.in

@@ -1,71 +0,0 @@
-%define majorminor  @GST_API_VERSION@
-%define gstreamer   gstreamer1
-%define gst_minver  1.0
-%define gst_majorminor  1.0
-
-Name: 		%{gstreamer}-libav
-Version: 	@VERSION@
-Release:	@PACKAGE_VERSION_RELEASE@	
-Summary: 	GStreamer Streaming-media framework plug-in using libav (FFmpeg).
-Group: 		Libraries/Multimedia
-License: 	LGPL
-URL:		http://gstreamer.net/
-Vendor:		GStreamer Backpackers Team <package@gstreamer.net>
-Source:		http://gstreamer.freedesktop.org/src/gst-ffmpeg/gst-ffmpeg/gst-libav-%{version}.tar.xz
-BuildRoot:	%{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
-
-Requires:  	%{gstreamer} >= 1.0.0
-BuildRequires: 	%{gstreamer}-devel >= 1.0.0
-BuildRequires: 	%{gstreamer}-plugins-base-devel >= 1.0.0
-
-%description
-GStreamer is a streaming-media framework, based on graphs of filters which
-operate on media data. Applications using this library can do anything
-from real-time sound processing to playing videos, and just about anything
-else media-related. Its plugin-based architecture means that new data
-types or processing capabilities can be added simply by installing new
-plug-ins.
-
-This plugin contains the libav (formerly FFmpeg) codecs, containing codecs for most popular
-multimedia formats.
-
-%prep
-%setup -q -n gst-libav-%{version}
-
-%build
-%configure
-
-make
-
-%install
-rm -rf $RPM_BUILD_ROOT
-
-%makeinstall
-rm -f $RPM_BUILD_ROOT%{_libdir}/gstreamer-%{gst_majorminor}/*.la
-rm -f $RPM_BUILD_ROOT%{_libdir}/gstreamer-%{gst_majorminor}/*.a
-
-%clean
-rm -rf $RPM_BUILD_ROOT
-
-%files
-%defattr(-, root, root, -)
-%doc AUTHORS COPYING README gst-libav.doap
-%{_libdir}/gstreamer-%{gst_majorminor}/libgstlibav.so
-%{_datadir}/gtk-doc/html/gst-libav-plugins-%{gst_majorminor}/*
-
-%changelog
-* Fri Aug 03 2012 Christian Schaller <uraeus@linuxrising.org>
-- update for 1.0 release and libav rename
-
-* Fri Dec 15 2006 Thomas Vander Stichele <thomas at apestaart dot org>
-- clean up
-- add doap file
-
-* Wed Oct 05 2004 Christian Schaller <christian at fluendo dot com>
-- Update SPEC file to fit the times
-
-* Sat Feb 14 2004 Thomas Vander Stichele <thomas at apestaart dot org>
-- Clean up spec file
-
-* Wed Jan 21 2004 Christian Schaller <Uraeus@gnome.org>
-- First version of spec