Add syntax files from upstream vim repository

indent/cpp.vim

@@ -0,0 +1,19 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'vim') == -1
+  
+" Vim indent file
+" Language:	C++
+" Maintainer:	Bram Moolenaar <Bram@vim.org>
+" Last Change:	2008 Nov 29
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+   finish
+endif
+let b:did_indent = 1
+
+" C++ indenting is built-in, thus this is very simple
+setlocal cindent
+
+let b:undo_indent = "setl cin<"
+
+endif