Use version macro for build requires

gstreamer1-libav.spec

@@ -7,8 +7,8 @@ License:        LGPLv2+
 URL:            http://gstreamer.freedesktop.org/
 Source0:        http://gstreamer.freedesktop.org/src/gst-libav/gst-libav-%{version}.tar.xz
 Patch0:         gst-ffmpeg-0.10.12-ChangeLog-UTF-8.patch
-BuildRequires:  gstreamer1-devel >= 1.11.1
+BuildRequires:  gstreamer1-devel >= %{version}
-BuildRequires:  gstreamer1-plugins-base-devel >= 1.11.1
+BuildRequires:  gstreamer1-plugins-base-devel >= %{version}
 BuildRequires:  orc-devel
 BuildRequires:  bzip2-devel
 BuildRequires:  zlib-devel