patch 9.0.1584: not all meson files are recognized

Problem:    Not all meson files are recognized.
Solution:   Add "meson.options". (Liam Beguin, closes #12444)

runtime/filetype.vim

@@ -1270,7 +1270,7 @@ au BufNewFile,BufRead *.hgrc,*hgrc		setf cfg
 au BufNewFile,BufRead *.mmd,*.mmdc,*.mermaid	setf mermaid
 
 " Meson Build system config
-au BufNewFile,BufRead meson.build,meson_options.txt setf meson
+au BufNewFile,BufRead meson.build,meson.options,meson_options.txt setf meson
 au BufNewFile,BufRead *.wrap			setf dosini
 
 " Messages (logs mostly)

src/testdir/test_filetype.vim

@@ -370,7 +370,7 @@ let s:filename_checks = {
     \            'file.wxm', 'maxima-init.mac'],
     \ 'mel': ['file.mel'],
     \ 'mermaid': ['file.mmd', 'file.mmdc', 'file.mermaid'],
-    \ 'meson': ['meson.build', 'meson_options.txt'],
+    \ 'meson': ['meson.build', 'meson.options', 'meson_options.txt'],
     \ 'messages': ['/log/auth', '/log/cron', '/log/daemon', '/log/debug', '/log/kern', '/log/lpr', '/log/mail', '/log/messages', '/log/news/news', '/log/syslog', '/log/user',
     \     '/log/auth.log', '/log/cron.log', '/log/daemon.log', '/log/debug.log', '/log/kern.log', '/log/lpr.log', '/log/mail.log', '/log/messages.log', '/log/news/news.log', '/log/syslog.log', '/log/user.log',
     \     '/log/auth.err', '/log/cron.err', '/log/daemon.err', '/log/debug.err', '/log/kern.err', '/log/lpr.err', '/log/mail.err', '/log/messages.err', '/log/news/news.err', '/log/syslog.err', '/log/user.err',

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1584,
 /**/
     1583,
 /**/