patch 9.0.1261: Elsa files are not recognized

Problem:    Elsa files are not recognized.
Solution:   Add a pattern for Elsa files. (Amaan Qureshi, closes #11908)
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index 3eef5a0..a6d87ae 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -179,6 +179,7 @@
     \ 'elixir': ['file.ex', 'file.exs', 'mix.lock'],
     \ 'elm': ['file.elm'],
     \ 'elmfilt': ['filter-rules'],
+    \ 'elsa': ['file.lc'],
     \ 'elvish': ['file.elv'],
     \ 'epuppet': ['file.epp'],
     \ 'erlang': ['file.erl', 'file.hrl', 'file.yaws'],
diff --git a/src/version.c b/src/version.c
index 2324ff2..3dcac43 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1261,
+/**/
     1260,
 /**/
     1259,