patch 9.0.0197: astro files are not detected

Problem:    Astro files are not detected.
Solution:   Add a pattern to match Astro files. (Emilia Zapata, closes #10904)

runtime/filetype.vim

@@ -172,6 +172,9 @@ au BufNewFile,BufRead *.asm,*.[sS],*.[aA],*.mac,*.lst	call dist#ft#FTasm()
 " Assembly - Macro (VAX)
 au BufNewFile,BufRead *.mar			setf vmasm
 
+" Astro
+au BufNewFile,BufRead *.astro			setf astro
+
 " Atlas
 au BufNewFile,BufRead *.atl,*.as		setf atlas
 

src/testdir/test_filetype.vim

@@ -71,6 +71,7 @@ let s:filename_checks = {
     \ 'asciidoc': ['file.asciidoc', 'file.adoc'],
     \ 'asn': ['file.asn', 'file.asn1'],
     \ 'asterisk': ['asterisk/file.conf', 'asterisk/file.conf-file', 'some-asterisk/file.conf', 'some-asterisk/file.conf-file'],
+    \ 'astro': ['file.astro'],
     \ 'atlas': ['file.atl', 'file.as'],
     \ 'autohotkey': ['file.ahk'],
     \ 'autoit': ['file.au3'],

src/version.c

@@ -735,6 +735,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    197,
 /**/
     196,
 /**/