OCaml: transient update of the stack to version 4.07.1

This is the first step in modernizing our OCaml ports infrastructure,
as we had accumulated substantial technical debt over the years when
many of its consumer ports had not received proper care and updates.

It is currently considered as the lowest supported version (baseline)
in majority of open-source OCaml projects, which would help to pull
up other ports, e.g. `devel/ocaml-dune' in smaller, manageable pieces.

For conservative hackers among us and for compatibility with RHEL 8
which is also on it, having 4.07 in the tree would allow users stick
to that package (pkg lock it) if needed.

PR:		250408, 262781
Exp-run by:	antoine

math/alt-ergo: fix build

Remove # $FreeBSD$ from Makefiles.

Remove the GUI option

The GUI is currently non functionnal on FreeBSD from my testing and depends
on deprecated gnome2 libraries

Mark as BROKEN on powerpc64:

  /tmp/camlasm2822e8.s: Assembler messages:
  /tmp/camlasm2822e8.s:10348: Error: operand out of range (0x000000000000804c is
not between 0xffffffffffff8000 and 0x0000000000007ffc)
  /tmp/camlasm2822e8.s:32988: Error: operand out of range (0x000000000000805c is
not between 0xffffffffffff8000 and 0x0000000000007ffc)

Reset ports maintained by bf@ until he has time again to work on them.

PR:		210474
Submitted by:	jbeich
With hat:	portmgr-secretary

Remove ${PORTSDIR}/ from dependencies, categories m, n, o, and p.

With hat:	portmgr
Sponsored by:	Absolight

- Add USE_OCAML_CAMLP4 and USE_OCAML_TK to bsd.ocaml.mk which add
  depends on the camlp4 language and labltk ocaml modules, which are
  now in separate ports.
- Update x11-toolkits/ocaml-lablgtk2 to 2.18.3
- Update graphics/ocaml-lablgl to 1.05
- Make unison ports use USE_OCAML
- Convert ports to the new flags where needed
- Bump PORTREVISION on ports depending on ocaml-lablgtk2, those need to be
rebuilt

PR:			199845
Submitted by:		jbeich@
Differential Revision:	https://reviews.freebsd.org/D2434
Approved by:		portmgr (mat)

Canonicalize a few licenses

Cleanup plist

Update the default version of GCC in the Ports Collection from GCC 4.7.4
to GCC 4.8.3.

Part II, Bump PORTREVISIONs.

PR:		192025
Tested by:	antoine (-exp runs)
Approved by:	portmgr (implicit)

Convert GMAKE to MAKE_CMD
Please note that lots of invocation of MAKE_CMD here are wrong as they do not
properly respect MAKE_ENV and friends

With hat:	portmgr

math/alt-ergo: Update version 0.94 => 0.95.2 and support stage

- Convert gmake,bzip2 to USES

Approved by:	portmgr

Add NO_STAGE all over the place in preparation for the staging support (cat:
math)

update master sites; trim headers; reposition LICENSE, WWW

switch to the new options format

update x11-toolkits/ocaml-lablgtk2 to 2.16.0+bugfixes, and adjust
dependent ports

PR:		144982, 149958
Reviewed by:	johans (earlier version of the patch)

- update png to 1.5.10

Add alt-ergo 0.94, an automatic theorem prover dedicated to program
verification.