vim-patch:9.0.0932: Oblivion files are not recognized (#21179)

Problem:    Oblivion files are not recognized.
Solution:   Recognize Oblivion files and alike as "obse". (closes vim/vim#11540)

ecfd511e8d

Co-authored-by: Bram Moolenaar <Bram@vim.org>

runtime/lua/vim/filetype.lua

@@ -729,6 +729,10 @@ local extension = {
   nsi = 'nsis',
   nsh = 'nsis',
   obj = 'obj',
+  obl = 'obse',
+  obse = 'obse',
+  oblivion = 'obse',
+  obscript = 'obse',
   mlt = 'ocaml',
   mly = 'ocaml',
   mll = 'ocaml',