Revert Merge #214786: libvmaf: fix build for BSD

This reverts commit a55d7e3b945d04ec9d4c98d48b23377749e54003, reversing
changes made to 547f6ab7a24d4a6bb2793b573911188c7f8056e4.
This casused way too big rebuild and doesn't seem urgent.

pkgs/development/libraries/libvmaf/default.nix

···
-{ lib, stdenv, fetchFromGitHub, fetchpatch, meson, ninja, nasm }:
+{ lib, stdenv, fetchFromGitHub, meson, ninja, nasm }:
 
 stdenv.mkDerivation rec {
   pname = "libvmaf";
···
   };
 
   sourceRoot = "source/libvmaf";
-
-  patches = [
-    # Backport fix for non-Linux, non-Darwin platforms.
-    (fetchpatch {
-      url = "https://github.com/Netflix/vmaf/commit/f47640f9ffee9494571bd7c9622e353660c93fc4.patch";
-      stripLen = 1;
-      sha256 = "rsTKuqp8VJG5DBDpixPke3LrdfjKzUO945i+iL0n7CY=";
-    })
-  ];
 
   nativeBuildInputs = [ meson ninja nasm ];