[build] Remove coqmktop in favor of ocamlfind.

We remove coqmktop in favor of a couple of simple makefile rules using
ocamlfind. In order to do that, we introduce a new top-level file that
calls the coqtop main entry.

This is very convenient in order to use other builds systems such as
`ocamlbuild` or `jbuilder`.

An additional consideration is that we must perform a side-effect on
init depending on whether we have an OCaml toplevel available [byte]
or not. We do that by using two different object files, one for the
bytecode version other for the native one, but we may want to review
our choice.

We also perform some smaller cleanups taking profit from ocamlfind.

1 files changed, 5 insertions, 7 deletions

diff --git a/lib/envars.ml b/lib/envars.ml
index 206d75033..8ebf84057 100644
--- a/lib/envars.ml
+++ b/lib/envars.ml
@@ -153,19 +153,17 @@ let coqpath =
 
 let exe s = s ^ Coq_config.exec_extension
 
-let ocamlfind () =
-  if !Flags.ocamlfind_spec then !Flags.ocamlfind else Coq_config.ocamlfind
+let ocamlfind () = Coq_config.ocamlfind
 
 (** {2 Camlp4 paths} *)
 
 let guess_camlp4bin () = which (user_path ()) (exe Coq_config.camlp4)
 
 let camlp4bin () =
-  if !Flags.camlp4bin_spec then !Flags.camlp4bin else
-    if !Flags.boot then Coq_config.camlp4bin else
-      try guess_camlp4bin ()
-      with Not_found ->
-        Coq_config.camlp4bin
+  if !Flags.boot then Coq_config.camlp4bin else
+    try guess_camlp4bin ()
+    with Not_found ->
+      Coq_config.camlp4bin
 
 let camlp4 () = camlp4bin () / exe Coq_config.camlp4