Revert "Disable bootstrapping by default."

This doesn't work well since non-bootstrapping cannot be used to move
from one minor release to the next.  For example if you have OCaml
4.07.0 then you cannot use non-bootstrapping to move to 4.07.1,
because the *.cmi files are incompatible between the two releases.

We need to rethink this.

This reverts commit 8f288a07f3.

ocaml.spec

@@ -25,12 +25,6 @@
 # Architectures where parallel builds fail.
 #%global no_parallel_build_arches aarch64
 
-# If you want to bootstrap OCaml on a brand new architecture, or if
-# you want to build OCaml without requiring an existing OCaml package,
-# or if you want to build OCaml exactly as it is built upstream (using
-# a binary ocamlc from the previous build), then use ‘--with bootstrap’.
-%bcond_with bootstrap
-
 Name:           ocaml
 Version:        4.07.0
 Release:        4%{?dist}
@@ -75,10 +69,6 @@ Patch0007:      0007-Adapt-to-4.07.patch
 # Sent upstream 2018-06-05.
 Patch0008:      0008-riscv-Emit-debug-info.patch
 
-%if ! %{with bootstrap}
-BuildRequires:  ocaml
-%endif
-
 BuildRequires:  gcc
 BuildRequires:  binutils-devel
 BuildRequires:  ncurses-devel
@@ -202,10 +192,7 @@ may not be portable between versions.
 %prep
 %setup -q -T -b 0 -n %{name}-%{version}
 %autopatch -p1
-%if ! %{with bootstrap}
+
-cp %{_bindir}/ocamlc.byte boot/ocamlc
-cp %{_bindir}/ocamllex.byte boot/ocamllex
-%endif
 
 %build
 %ifnarch %{no_parallel_build_arches}