eclipse: name plugins "eclipse-plugin-${name}"

Instead of "eclipse-${name}". The latter is slightly confusing since
there are non-plugin eclipse packages named "eclipse-${name}", like
eclipse-modeling or eclipse-cpp.

Changed files
+1 -1
pkgs
applications
editors
eclipse
+1 -1
pkgs/applications/editors/eclipse/plugins.nix
···
, passthru ? {}
, ... } @ attrs:
stdenv.mkDerivation (attrs // {
-
name = "eclipse-" + name;
+
name = "eclipse-plugin-" + name;
buildInputs = buildInputs ++ [ unzip ];