Add syntax files from upstream vim repository

ftplugin/initex.vim

@@ -0,0 +1,43 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'vim') == -1
+  
+" filetype plugin for TeX and variants
+" Language:     TeX (ft=initex)
+" Maintainer:   Benji Fisher, Ph.D. <benji@member.AMS.org>
+" Version:	1.0
+" Last Change:	Wed 19 Apr 2006
+
+" Only do this when not done yet for this buffer.
+if exists("b:did_ftplugin")
+  finish
+endif
+
+" Don't load another plugin for this buffer.
+let b:did_ftplugin = 1
+
+" Avoid problems if running in 'compatible' mode.
+let s:save_cpo = &cpo
+set cpo&vim
+
+let b:undo_ftplugin = "setl com< cms< define< include< sua<"
+
+" Set 'comments' to format dashed lists in comments
+setlocal com=sO:%\ -,mO:%\ \ ,eO:%%,:%
+
+" Set 'commentstring' to recognize the % comment character:
+" (Thanks to Ajit Thakkar.)
+setlocal cms=%%s
+
+" Allow "[d" to be used to find a macro definition:
+let &l:define='\\\([egx]\|char\|mathchar\|count\|dimen\|muskip\|skip\|toks\)\='
+	\ .	'def\|\\font\|\\\(future\)\=let'
+
+" Tell Vim to recognize \input bar :
+let &l:include = '\\input'
+setlocal suffixesadd=.tex
+
+let &cpo = s:save_cpo
+unlet s:save_cpo
+
+" vim:sts=2:sw=2:
+
+endif