Change latex provider to luatex, closes #476

compiler/lacheck.vim

@@ -0,0 +1,20 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'latex') == -1
+
+if exists('current_compiler') | finish | endif
+let current_compiler = 'lacheck'
+
+" Older Vim always used :setlocal
+if exists(':CompilerSet') != 2
+  command -nargs=* CompilerSet setlocal <args>
+endif
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+CompilerSet makeprg=lacheck\ %:S
+CompilerSet errorformat="%f",\ line\ %l:\ %m
+
+let &cpo = s:cpo_save
+unlet s:cpo_save
+
+endif