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)

runtime/filetype.vim

@@ -629,6 +629,9 @@ au BufNewFile,BufRead *.elm			setf elm
 " Elm Filter Rules file
 au BufNewFile,BufRead filter-rules		setf elmfilt
 
+" Elsa - https://github.com/ucsd-progsys/elsa
+au BufNewFile,BufRead *.lc			setf elsa
+
 " ESMTP rc file
 au BufNewFile,BufRead *esmtprc			setf esmtprc
 

src/testdir/test_filetype.vim

@@ -179,6 +179,7 @@ let s:filename_checks = {
     \ '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'],

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1261,
 /**/
     1260,
 /**/