runtime: Remove more fallback :CompilerSet definitions from compiler plugins (#14413)

Continue with #14399

Signed-off-by: jiangyinzuo <jiangyinzuo@foxmail.com>
Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/compiler/cargo.vim b/runtime/compiler/cargo.vim
index cae2e51..bbea45d 100644
--- a/runtime/compiler/cargo.vim
+++ b/runtime/compiler/cargo.vim
@@ -2,7 +2,7 @@
 " Compiler:         Cargo Compiler
 " Maintainer:       Damien Radtke <damienradtke@gmail.com>
 " Latest Revision:  2023-09-11
-"                   2024 Apr 03 by The Vim Project (removed :CompilerSet definition)
+"                   2024 Apr 05 by The Vim Project (removed :CompilerSet definition)
 " For bugs, patches and license go to https://github.com/rust-lang/rust.vim
 
 if exists('current_compiler')
@@ -16,10 +16,6 @@
 set cpo&vim
 " vint: +ProhibitAbbreviationOption
 
-if exists(':CompilerSet') != 2
-    command -nargs=* CompilerSet setlocal <args>
-endif
-
 if exists('g:cargo_makeprg_params')
     execute 'CompilerSet makeprg=cargo\ '.escape(g:cargo_makeprg_params, ' \|"').'\ $*'
 else