Add syntax files from upstream vim repository

syntax/change.vim

@@ -0,0 +1,33 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'vim') == -1
+  
+" Vim syntax file
+" Language:	WEB Changes
+" Maintainer:	Andreas Scherer <andreas.scherer@pobox.com>
+" Last Change:	April 25, 2001
+
+" Details of the change mechanism of the WEB and CWEB languages can be found
+" in the articles by Donald E. Knuth and Silvio Levy cited in "web.vim" and
+" "cweb.vim" respectively.
+
+" quit when a syntax file was already loaded
+if exists("b:current_syntax")
+  finish
+endif
+
+" We distinguish two groups of material, (a) stuff between @x..@y, and
+" (b) stuff between @y..@z. WEB/CWEB ignore everything else in a change file.
+syn region changeFromMaterial start="^@x.*$"ms=e+1 end="^@y.*$"me=s-1
+syn region changeToMaterial start="^@y.*$"ms=e+1 end="^@z.*$"me=s-1
+
+" Define the default highlighting.
+" Only when an item doesn't have highlighting yet
+
+hi def link changeFromMaterial String
+hi def link changeToMaterial Statement
+
+
+let b:current_syntax = "change"
+
+" vim: ts=8
+
+endif