qt55.vlc: fix build

I tested it on a video to make sure the bug doesn't appear.

pkgs/applications/video/vlc/default.nix

@@ -27,6 +27,11 @@ stdenv.mkDerivation rec {
     sha256 = "1dazxbmzx2g5570pkg519a7fsj07rdr155kjsw7b9y8npql33lls";
   };
 
+  # Comment-out the Qt 5.5 version check, as we do apply the relevant patch.
+  # https://trac.videolan.org/vlc/ticket/16497
+  postPatch = if (!withQt5) then null else
+    "sed '/I78ef29975181ee22429c9bd4b11d96d9e68b7a9c/s/^/: #/' -i configure";
+
   buildInputs =
     [ xz bzip2 perl zlib a52dec libmad faad2 ffmpeg alsaLib libdvdnav libdvdnav.libdvdread
       libbluray dbus fribidi libvorbis libtheora speex lua5 libgcrypt