patch 9.0.1090: FHIR Shorthand files are not recognized

Problem:    FHIR Shorthand files are not recognized.
Solution:   Add a pattern to detect FSH files. (Matthew Gramigna,
            closes #11738)

runtime/filetype.vim

@@ -701,6 +701,9 @@ au BufRead,BufNewFile *.fusion			setf fusion
 " F# or Forth
 au BufNewFile,BufRead *.fs			call dist#ft#FTfs()
 
+" FHIR Shorthand (FSH)
+au BufNewFile,BufRead *.fsh			setf fsh
+
 " F#
 au BufNewFile,BufRead *.fsi,*.fsx		setf fsharp
 

src/testdir/test_filetype.vim

@@ -202,6 +202,7 @@ let s:filename_checks = {
     \ 'fpcmake': ['file.fpc'],
     \ 'framescript': ['file.fsl'],
     \ 'freebasic': ['file.fb'],
+    \ 'fsh': ['file.fsh'],
     \ 'fsharp': ['file.fs', 'file.fsi', 'file.fsx'],
     \ 'fstab': ['fstab', 'mtab'],
     \ 'fusion': ['file.fusion'],

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1090,
 /**/
     1089,
 /**/