Update packages/ocaml-variants/ocaml-variants.5.1.0~rc3+tsan/opam

Author: kit-ty-kate

packages/ocaml-variants/ocaml-variants.5.1.0~rc3+tsan/opam

@@ -47,10 +47,7 @@ url {
   src: "https://github.com/ocaml-multicore/ocaml-tsan/archive/5.1.0-rc3+tsan.tar.gz"
   checksum: "sha256=d5b80d65ace8912f060b14d552b06ea1df9ef28f0cd0e70a951bb5398fb0d491"
 }
-extra-files: [
-  ["ocaml-variants.install" "md5=3e969b841df1f51ca448e6e6295cb451"]
-  ["check-tsan-distinguish-volatile.patch" "md5=6e47bf51a2360805f49579884d51c29c"]
-]
+extra-files: ["ocaml-variants.install" "md5=3e969b841df1f51ca448e6e6295cb451"]
 post-messages: [
   "A failure in the middle of the build may be caused by build parallelism
    (enabled by default).