vim-patch:9.0.1773: cannot distinguish Forth and Fortran *.f files (#24841)

Problem:  cannot distinguish Forth and Fortran *.f files
Solution: Add Filetype detection Code

Also add *.4th as a Forth filetype

closes: vim/vim#12251

19a3bc3add

Don't remove filetype files from Vim patches:
- filetype.vim, script.vim, ft.vim usually contain useful changes
- script.vim and ft.vim don't even have their paths spelled correctly

Co-authored-by: Doug Kearns <dougkearns@gmail.com>

scripts/vim-patch.sh

@@ -202,9 +202,9 @@ preprocess_patch() {
   # Remove *.proto, Make*, INSTALL*, gui_*, beval.*, some if_*, gvim, libvterm, tee, VisVim, xpm, xxd
   local na_src='auto\|configure.*\|GvimExt\|hardcopy.*\|libvterm\|proto\|tee\|VisVim\|xpm\|xxd\|Make.*\|INSTALL.*\|beval.*\|gui.*\|if_cscop\|if_lua\|if_mzsch\|if_olepp\|if_ole\|if_perl\|if_py\|if_ruby\|if_tcl\|if_xcmdsrv'
   2>/dev/null $nvim --cmd 'set dir=/tmp' +'g@^diff --git a/src/\S*\<\%(testdir/\)\@<!\%('"${na_src}"'\)\>@norm! d/\v(^diff)|%$
-' +w +q "$file"
-
-  # Remove runtime files ported to Lua.
+' +w +q "$file"
+
+  # Remove runtime/print/
   local na_rt='print\/.*'
   2>/dev/null $nvim --cmd 'set dir=/tmp' +'g@^diff --git a/runtime/\<\%('"${na_rt}"'\)\>@norm! d/\v(^diff)|%$' +w +q "$file"