Add syntax files from upstream vim repository

ftplugin/logtalk.vim

@@ -0,0 +1,22 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'vim') == -1
+  
+" Logtalk filetype plugin file
+" Language:         Logtalk
+" Maintainer:       Paulo Moura <pmoura@logtalk.org>
+" Latest Revision:  2007-07-06
+
+if exists("b:did_ftplugin")
+  finish
+endif
+let b:did_ftplugin = 1
+
+let b:undo_ftplugin = "setl ts< sw< fdm< fdc< ai< dict<"
+
+"setlocal ts=4
+setlocal sw=4
+setlocal fdm=syntax
+setlocal fdc=2
+setlocal autoindent
+setlocal dict=$VIMRUNTIME/ftplugin/logtalk.dict
+
+endif