Add syntax files from upstream vim repository

compiler/go.vim

@@ -1,3 +1,36 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'vim') == -1
+  
+" Vim compiler file
+" Compiler:	Go
+" Maintainer:	David Barnett (https://github.com/google/vim-ft-go)
+" Last Change:	2014 Aug 16
+
+if exists('current_compiler')
+  finish
+endif
+let current_compiler = 'go'
+
+if exists(':CompilerSet') != 2
+  command -nargs=* CompilerSet setlocal <args>
+endif
+
+let s:save_cpo = &cpo
+set cpo-=C
+
+CompilerSet makeprg=go\ build
+CompilerSet errorformat=
+    \%-G#\ %.%#,
+    \%A%f:%l:%c:\ %m,
+    \%A%f:%l:\ %m,
+    \%C%*\\s%m,
+    \%-G%.%#
+
+let &cpo = s:save_cpo
+unlet s:save_cpo
+
+" vim: sw=2 sts=2 et
+
+endif
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'go') == -1
   
 " Copyright 2013 The Go Authors. All rights reserved.