vim-patch:9.0.2071: objdump files not recognized

Problem:  objdump files not recognized
Solution: detect *.objdump files, add a filetype plugin

Added the objdump file/text format

closes: vim/vim#13425

10407df7a9

Co-authored-by: Colin Kennedy <colinvfx@gmail.com>

runtime/lua/vim/filetype.lua

@@ -716,6 +716,8 @@ local extension = {
   nsi = 'nsis',
   nsh = 'nsis',
   obj = 'obj',
+  objdump = 'objdump',
+  cppobjdump = 'objdump',
   obl = 'obse',
   obse = 'obse',
   oblivion = 'obse',