patch 8.2.2334: Pascal-like filetypes not always detected

Problem:    Pascal-like filetypes not always detected.
Solution:   Improved Puppet, InstantFPC and Pascal detection. (Doug Kearns,
            closes #7662)

runtime/scripts.vim

@@ -182,6 +182,10 @@ if s:line1 =~# "^#!"
   elseif s:name =~# 'clojure'
     set ft=clojure
 
+    " Free Pascal
+  elseif s:name =~# 'instantfpc\>'
+    set ft=pascal
+
   endif
   unlet s:name