vim-patch:7c3f9af: runtime(misc): unset compiler in various ftplugins

just to foster best practices

closes: vim/vim#15798

7c3f9af0ed

Co-authored-by: Konfekt <Konfekt@users.noreply.github.com>

runtime/ftplugin/requirements.vim

@@ -36,7 +36,11 @@ let b:undo_ftplugin = "setl iskeyword< commentstring<"
 " pip options contain "-"
 setlocal iskeyword+=-
 setlocal commentstring=#\ %s
-compiler pip_compile
+
+if !exists('current_compiler')
+  let b:undo_ftplugin ..= "| compiler make"
+  compiler  pip_compile
+endif
 
 let &cpoptions = s:save_cpoptions
 unlet s:save_cpoptions