patch 9.0.1351: Dhall files are not recognized

Problem:    Dhall files are not recognized.
Solution:   Add patterns for Dhall files. (Amaan Qureshi, closes #12052)
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index b8dc6ee..7647163 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -155,6 +155,7 @@
     \ 'denyhosts': ['denyhosts.conf'],
     \ 'desc': ['file.desc'],
     \ 'desktop': ['file.desktop', '.directory', 'file.directory'],
+    \ 'dhall': ['file.dhall'],
     \ 'dictconf': ['dict.conf', '.dictrc'],
     \ 'dictdconf': ['dictd.conf', 'dictdfile.conf', 'dictd-file.conf'],
     \ 'diff': ['file.diff', 'file.rej'],
diff --git a/src/version.c b/src/version.c
index f4dbd16..6f2bd4c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1351,
+/**/
     1350,
 /**/
     1349,