Accepting request 889212 from devel:languages:ocaml

- Update to version 2.51.4_rc2
  remove Compatibility-with-OCaml-4.08.patch
  remove Compile-without-unsafe-string.patch
  remove Fix-for-lablgtk-2.18.6.patch
  remove Fix-warnings-raised-by-OCaml-4.08.1.patch
- Remove ocaml_native_compiler conditional
  build native target unconditionally

OBS-URL: https://build.opensuse.org/request/show/889212
OBS-URL: https://build.opensuse.org/package/show/openSUSE:Factory/unison?expand=0&rev=40

_service

@@ -1,7 +1,7 @@
 <services>
   <service name="tar_scm" mode="disabled">
     <param name="filename">unison</param>
-    <param name="revision">0176188107aa9fb82657ed9fcd92081f5a61c76a</param>
+    <param name="revision">2e12fc4f41b39ca9a5e501d7df5c2c33a75d3b95</param>
     <param name="scm">git</param>
     <param name="subdir">src</param>
     <param name="submodules">disable</param>