Re: [Libguestfs] [PATCH 01/27] build: Make OCaml compiler required for all builds.

Previously the OCaml compiler was only required if building from git but was at least theoretically optional if building from tarballs (although this was never tested). Since we want to write parts of the daemon in OCaml, this makes OCaml required for all builds. Note that the ‘--disable-ocaml’ option remains, but it now only disables OCaml bindings and OCaml virt tools. Using this option does not disable the OCaml compiler requirement. Also note that ‘HAVE_OCAML’ changes meaning slightly, so it now means "build OCaml bindings and tools" (analogous to ‘HAVE_PERL’ and others). The generator, daemon [in a future commit], and some utility libraries needed by the generator or daemon do not test for this macro because we can assume OCaml compiler availability. ---