libfabric: split outputs -> out, dev, man

pkgs/development/libraries/libfabric/default.nix

···
     sha256 = "sha256-7VOhdZOPBe1qh8OK8OTNKA5I4A5whl6aOubAzsUDSRw=";
   };
 
+  outputs = [ "out" "dev" "man" ];
+
   nativeBuildInputs = [ pkg-config autoreconfHook ];
 
   buildInputs = lib.optionals enableOpx [ libuuid numactl ] ++ lib.optionals enablePsm2 [ libpsm2 ];