Remove vim syntax files

The new canonical place for the vim syntax file is in the upstream vim
tree.  All improvements and patches should be submitted there.

https://github.com/vim/vim/blob/master/runtime/syntax/dockerfile.vim

Signed-off-by: Honza Pokorny <me@honza.ca>

contrib/syntax/vim/LICENSE

@@ -1,22 +0,0 @@
-Copyright (c) 2013 Honza Pokorny
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-1. Redistributions of source code must retain the above copyright
-   notice, this list of conditions and the following disclaimer.
-2. Redistributions in binary form must reproduce the above copyright
-   notice, this list of conditions and the following disclaimer in the
-   documentation and/or other materials provided with the distribution.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
-ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
-ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
-ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

contrib/syntax/vim/README.md

@@ -3,28 +3,9 @@ dockerfile.vim
 
 Syntax highlighting for Dockerfiles
 
-Installation
-------------
-With [pathogen](https://github.com/tpope/vim-pathogen), the usual way...
+-------------------------------------------------------------------------------
 
-With [Vundle](https://github.com/gmarik/Vundle.vim)
+dockerfile.vim has been merged into upstream vim, and has therefore been deleted
+from here.  You can find the canonical version [here][1].
 
-    Plugin 'moby/moby' , {'rtp': '/contrib/syntax/vim/'}
-
-With [vim-plug](https://github.com/junegunn/vim-plug)
-
-    Plug 'moby/moby' , {'rtp': '/contrib/syntax/vim/'}
-
-Features
---------
-
-The syntax highlighting includes:
-
-* The directives (e.g. `FROM`)
-* Strings
-* Comments
-
-License
--------
-
-BSD, short and sweet
+[1]: https://github.com/vim/vim/blob/master/runtime/syntax/dockerfile.vim

contrib/syntax/vim/doc/dockerfile.txt

@@ -1,18 +0,0 @@
-*dockerfile.txt*  Syntax highlighting for Dockerfiles
-
-Author: Honza Pokorny <https://honza.ca>
-License: BSD
-
-INSTALLATION                                                     *installation*
-
-Drop it on your Pathogen path and you're all set.
-
-FEATURES                                                             *features*
-
-The syntax highlighting includes:
-
-* The directives (e.g. FROM)
-* Strings
-* Comments
-
- vim:tw=78:et:ft=help:norl:

contrib/syntax/vim/ftdetect/dockerfile.vim

@@ -1 +0,0 @@
-au BufNewFile,BufRead [Dd]ockerfile,[Dd]ockerfile.*,*.[Dd]ockerfile set filetype=dockerfile

contrib/syntax/vim/syntax/dockerfile.vim

@@ -1,31 +0,0 @@
-" dockerfile.vim - Syntax highlighting for Dockerfiles
-" Maintainer:   Honza Pokorny <https://honza.ca>
-" Version:      0.5
-
-
-if exists("b:current_syntax")
-    finish
-endif
-
-let b:current_syntax = "dockerfile"
-
-syntax case ignore
-
-syntax match dockerfileKeyword /\v^\s*(ONBUILD\s+)?(ADD|ARG|CMD|COPY|ENTRYPOINT|ENV|EXPOSE|FROM|HEALTHCHECK|LABEL|MAINTAINER|RUN|SHELL|STOPSIGNAL|USER|VOLUME|WORKDIR)\s/
-highlight link dockerfileKeyword Keyword
-
-syntax region dockerfileString start=/\v"/ skip=/\v\\./ end=/\v"/
-highlight link dockerfileString String
-
-syntax match dockerfileComment "\v^\s*#.*$"
-highlight link dockerfileComment Comment
-
-set commentstring=#\ %s
-
-" match "RUN", "CMD", and "ENTRYPOINT" lines, and parse them as shell
-let s:current_syntax = b:current_syntax
-unlet b:current_syntax
-syntax include @SH syntax/sh.vim
-let b:current_syntax = s:current_syntax
-syntax region shLine matchgroup=dockerfileKeyword start=/\v^\s*(RUN|CMD|ENTRYPOINT)\s/ end=/\v$/ contains=@SH
-" since @SH will handle "\" as part of the same line automatically, this "just works" for line continuation too, but with the caveat that it will highlight "RUN echo '" followed by a newline as if it were a block because the "'" is shell line continuation...  not sure how to fix that just yet (TODO)