Register all PrimOps via the Info structure

This will allow documenting them (in later commits).

Note that we keep the old constructor even if it is no longer used by
Nix code, because it is used in tests/plugins/plugintest.cc, which
suggests that it might be used by some external plugin.

src/libexpr/primops/fromTOML.cc

@@ -90,6 +90,10 @@ static void prim_fromTOML(EvalState & state, const PosIdx pos, Value * * args, V
     }
 }
 
-static RegisterPrimOp primop_fromTOML("fromTOML", 1, prim_fromTOML);
+static RegisterPrimOp primop_fromTOML({
+    .name = "fromTOML",
+    .arity = 1,
+    .fun = prim_fromTOML
+});
 
 }