restore support for proposing builtins

Author: bhcleek

autoload/go/complete.vim

@@ -9,6 +9,11 @@ function! s:gocodeCommand(cmd, args) abort
   let cmd = [bin_path]
   let cmd = extend(cmd, ['-sock', socket_type])
   let cmd = extend(cmd, ['-f', 'vim'])
+
+  if go#config#GocodeProposeBuiltins()
+    let cmd = extend(cmd, ['-builtin'])
+  endif
+
   let cmd = extend(cmd, [a:cmd])
   let cmd = extend(cmd, a:args)
 

autoload/go/config.vim

@@ -140,6 +140,10 @@ function! go#config#GocodeSocketType() abort
   return get(g:, 'go_gocode_socket_type', s:sock_type)
 endfunction
 
+function! go#config#GocodeProposeBuiltins() abort
+  return get(g:, 'go_gocode_propose_builtins', 1)
+endfunction
+
 function! go#config#EchoCommandInfo() abort
   return get(g:, 'go_echo_command_info', 1)
 endfunction

doc/vim-go.txt

@@ -1544,7 +1544,13 @@ same.
         \ '? go#util#pascalcase(expand("<cword>"))' .
         \ ': go#util#camelcase(expand("<cword>"))'
 <
+                                              *'g:go_gocode_propose_builtins'*
 
+Specifies whether `gocode` should add built-in types, functions and constants
+to an autocompletion proposals. By default it is enabled.
+>
+  let g:go_gocode_propose_builtins = 1
+<
                                                    *'g:go_gocode_socket_type'*
 
 Specifies whether `gocode` should use a different socket type. By default