{lib}mediainfo-gui: 0.7.78 -> 0.7.79

Following a commit by @k0ral, this completes the upgrade of the other
`mediainfo` components.

From the changelog:
```
Version 0.7.79, 2015-11-02
+ CLI/DLL only, XML: new option --Output=MIXML, with XML v2.0beta1
  status, not for production, see
  https://github.com/MediaArea/MediaAreaXml for more details
+ MediaTrace: support of more than 1 file in XML output.
+ CLI/DLL only, XML: new option --Output=MAXML, with XML v0.1 status, in
  order to have bot MediaInfo and MediaTrace in the same output, not for
  production, see https://github.com/MediaArea/MediaAreaXml for more
  details
x MediaTrace: fixed some invalid outputs
x #B951, Amazon S3 support (REST API v2), CLI/DLL only and if compiled
  with libcurl support: URL without credential were badly interpreted
```

pkgs/applications/misc/mediainfo-gui/default.nix

@@ -1,11 +1,11 @@
 { stdenv, fetchurl, automake, autoconf, libtool, pkgconfig, libzen, libmediainfo, wxGTK, desktop_file_utils, libSM, imagemagick }:
 
 stdenv.mkDerivation rec {
-  version = "0.7.78";
+  version = "0.7.79";
   name = "mediainfo-gui-${version}";
   src = fetchurl {
     url = "http://mediaarea.net/download/source/mediainfo/${version}/mediainfo_${version}.tar.xz";
-    sha256 = "0458rxla3nhw9rbb2psak8qvxwr0drfhdl82k6wvb3a38xb0qij3";
+    sha256 = "0qwb3msw9gfzdymlirpvzah0lcszc2p67jg8k5ca2camymnfcvx3";
   };
 
   buildInputs = [ automake autoconf libtool pkgconfig libzen libmediainfo wxGTK desktop_file_utils libSM imagemagick ];

pkgs/development/libraries/libmediainfo/default.nix

@@ -1,11 +1,11 @@
 { stdenv, fetchurl, automake, autoconf, libtool, pkgconfig, libzen, zlib }:
 
 stdenv.mkDerivation rec {
-  version = "0.7.78";
+  version = "0.7.79";
   name = "libmediainfo-${version}";
   src = fetchurl {
     url = "http://mediaarea.net/download/source/libmediainfo/${version}/libmediainfo_${version}.tar.xz";
-    sha256 = "0ai4al5h3qbfq5f1b24ixk5v1fpln2kw1zmdj4hxjz40rj18qzka";
+    sha256 = "0lanhx1zg7s36wgi9ndv4zz7dbhkqz4dc99mva6x9rcj2p5p8c6d";
   };
 
   buildInputs = [ automake autoconf libtool pkgconfig libzen zlib ];