nix: package renamed: swiProlog -> swi-prolog

nix/meta.nix

 { mk_plugin
-, swiProlog
+, swi-prolog
 }:
 
 mk_plugin {
   plugin-name = "metacsl" ;
   plugin-src = fetchGit { shallow=true ; url=./.. ; } ;
-  additional-check-inputs = [ swiProlog ] ;
+  additional-check-inputs = [ swi-prolog ] ;
   has-wp-proofs = true ;
 }