Do not detect unofficial file extensions when embedded into Vim

Since BitBake already claimed the `.bb` file extension before Babashka,
we cannot override it in upstream Vim, hence we register an optional
`after` ftdetect plugin for various unofficial Clojure file extensions.

I'm not a fan of using `after` for this, so I may change it at a later
date.

Author: axvr

after/ftdetect/clojure.vim

@@ -0,0 +1,3 @@
+if get(g:, 'clojure_detect_unofficial_exts', 1)
+    autocmd BufNewFile,BufRead {build,profile}.boot,*.bb,*.clj_kondo setlocal filetype=clojure
+endif

ftdetect/clojure.vim

@@ -1 +1 @@
-autocmd BufNewFile,BufRead *.clj,*.cljs,*.edn,*.cljx,*.cljc,{build,profile}.boot,*.bb,*.clj_kondo setlocal filetype=clojure
+autocmd BufNewFile,BufRead *.clj,*.cljs,*.edn,*.cljx,*.cljc setlocal filetype=clojure