Add syntax files from upstream vim repository

compiler/mcs.vim

@@ -0,0 +1,34 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'vim') == -1
+  
+" Vim compiler file
+" Compiler:    Mono C# Compiler
+" Maintainer:  Jarek Sobiecki <harijari@go2.pl>
+" Last Updated By: Peter Collingbourne
+" Latest Revision: 2012 Jul 19
+
+if exists("current_compiler")
+  finish
+endif
+let current_compiler = "mcs"
+
+let s:cpo_save = &cpo
+set cpo-=C
+
+setlocal errorformat=
+         \%D%.%#Project\ \"%f/%[%^/\"]%#\"%.%#,
+         \%X%.%#Done\ building\ project\ \"%f/%[%^/\"]%#\"%.%#,
+         \%-G%\\s%.%#,
+         \%E%f(%l):\ error\ CS%n:%m,
+         \%W%f(%l):\ warning\ CS%n:%m,
+         \%E%f(%l\\,%c):\ error\ CS%n:%m,
+         \%W%f(%l\\,%c):\ warning\ CS%n:%m,
+         \%E%>syntax\ error\\,%m,%Z%f(%l\\,%c):\ error\ CS%n:%m,
+         \%D%*\\a[%*\\d]:\ Entering\ directory\ `%f',
+         \%X%*\\a[%*\\d]:\ Leaving\ directory\ `%f',
+         \%DMaking\ %*\\a\ in\ %f,
+         \%-G%.%#
+
+let &cpo = s:cpo_save
+unlet s:cpo_save
+
+endif