vim-patch:ac1bb93: runtime(jinja): Include ftplugin for jinja filetype

closes: vim/vim#20778

https://github.com/vim/vim/commit/ac1bb93421593e8661017a015966fba43b580d1e

Co-authored-by: Wu, Zhenyu <wuzhenyu@ustc.edu>
Co-Authored-by: Alejandro Sanchez <hiphish@posteo.de>

runtime/ftplugin/jinja.vim

@@ -0,0 +1,11 @@
+" Vim ftplugin file
+" Language: Jinja
+" Maintainer: Alejandro Sanchez
+" Upstream: https://gitlab.com/HiPhish/jinja.vim
+
+if exists("b:did_jinjaplugin")
+ finish
+endif
+
+setlocal commentstring={#\ %s\ #}
+let b:undo_ftplugin = "setlocal com<"