Fixed compatible mode in most runtime files.

runtime/compiler/cs.vim

@@ -2,12 +2,14 @@
 " Compiler:	Microsoft Visual Studio C#
 " Maintainer:	Zhou YiChao (broken.zhou@gmail.com)
 " Previous Maintainer:	Joseph H. Yao (hyao@sina.com)
-" Last Change:	2011 Apr 21
+" Last Change:	2012 Apr 30
 
 if exists("current_compiler")
   finish
 endif
 let current_compiler = "cs"
+let s:keepcpo= &cpo
+set cpo&vim
 
 if exists(":CompilerSet") != 2		" older Vim always used :setlocal
   command -nargs=* CompilerSet setlocal <args>
@@ -19,3 +21,6 @@ CompilerSet errorformat+=%f(%l\\,%v):\ %t%*[^:]:\ %m,
             \%tarning%*[^:]:\ %m
 
 CompilerSet makeprg=csc\ %
+
+let &cpo = s:keepcpo
+unlet s:keepcpo