vim-patch:8.2.3464: nginx files are not recognized (#15883)

Problem:    nginx files are not recognized.
Solution:   Add several file patterns. (Chris Aumann, closes vim/vim#8922)
8b8c0ed657

src/nvim/testdir/test_filetype.vim

@@ -344,6 +344,7 @@ let s:filename_checks = {
     \ 'nanorc': ['/etc/nanorc', 'file.nanorc', 'any/etc/nanorc'],
     \ 'ncf': ['file.ncf'],
     \ 'netrc': ['.netrc'],
+    \ 'nginx': ['file.nginx', 'nginxfile.conf', 'filenginx.conf', 'any/etc/nginx/file', 'any/usr/local/nginx/conf/file', 'any/nginx/file.conf'],
     \ 'ninja': ['file.ninja'],
     \ 'nqc': ['file.nqc'],
     \ 'nroff': ['file.tr', 'file.nr', 'file.roff', 'file.tmac', 'file.mom', 'tmac.file'],