Remove WWW entries moved into port Makefiles

Commit b7f05445c00f has added WWW entries to port Makefiles based on
WWW: lines in pkg-descr files.

This commit removes the WWW: lines of moved-over URLs from these
pkg-descr files.

Approved by:		portmgr (tcberner)

Add WWW entries to port Makefiles

It has been common practice to have one or more URLs at the end of the
ports' pkg-descr files, one per line and prefixed with "WWW:". These
URLs should point at a project website or other relevant resources.

Access to these URLs required processing of the pkg-descr files, and
they have often become stale over time. If more than one such URL was
present in a pkg-descr file, only the first one was tarnsfered into
the port INDEX, but for many ports only the last line did contain the
port specific URL to further information.

There have been several proposals to make a project URL available as
a macro in the ports' Makefiles, over time.

math/flint2: Update 2.8.5 -> 2.9.0

math/flint2: Update 2.8.4 -> 2.8.5

Reported by:	portscout

math/ntl: Update 11.4.3 -> 11.5.1

PR:		259363
Approved by:	ndowens04@gmail.com (maintainer's timeout, 58 days)

math/flint2: Update 2.8.1 -> 2.8.4

Reported by:	portscout

math/flint2: Update 2.8.0 -> 2.8.1

Reported by:	portscout

math/flint2: Update 2.7.1 -> 2.8.0

Bump 12 consumer ports.

Reported by:	portscout

One more small cleanup, forgotten yesterday.
Reported by:	lwhsu

math/flint2: Add explicit Python build dependency (D29353)

This unbreaks the build when using devel/samurai.

It previously got it through ninja which has a run dependency on
Python.

CMake Error at
/usr/local/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:218
(message):
  Could NOT find PythonInterp (missing: PYTHON_EXECUTABLE)
Call Stack (most recent call first):
  /usr/local/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:582
(_FPHSA_FAILURE_MESSAGE)
  /usr/local/share/cmake/Modules/FindPythonInterp.cmake:169
(FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  CMakeLists.txt:37 (find_package)

http://package18.nyi.freebsd.org/data/122amd64-default-foo/2021-04-04_07h37m38s/logs/errors/flint2-2.7.1.log

PR:		254678

Remove # $FreeBSD$ from Makefiles.

math/e-antic has been broken since r558890 of math/flint2: upgrade it
to 1.0.0-rc.12 in order to fix it.

Release notes at <https://github.com/flatsurf/e-antic/releases>.

math/flint2: Update 2.7.0 -> 2.7.1

Reported by:	portscout

math/flint2: Update 2.6.3 -> 2.7.0

Reported by:	portscout

math/flint2: Update 2.6.2 -> 2.6.3

Reported by:	portscout

math/flint2: Update 2.6.1 -> 2.6.2

Reported by:	portscout

math/flint2: Update 2.6.0 -> 2.6.1

Reported by:	portscout

math/flint2: Update g20190210 -> 2.6.0

Bump 6 depending ports.

Reported by:	portscout

C++11 language features are needed.

PR:		245112
Submitted by:	canardo909 (at) gmx.com

Add an option to build the support of NTL.

Set the option by default, because it is used by SageMath.

PR:		245085
Approved by:	yuri (maintainer)

math/flint2: fix build on non-x86

Merge upstream patches for non-x86 architectures.

PR:		243851
MFH:		2020Q1 (fix build blanket)

math/flint2: Update g20180323 -> g20190210

Bump math/arb.

Change cmake default behaviour to outsource.

Ports that build out of source now simply can use "USES=cmake"
instead of "USES=cmake:outsource". Ports that fail to build
out of source now need to specify "USES=cmake:insource".

I tried to only set insource where explictely needed.

PR:		232038
Exp-run by:	antoine

These ports now build on powerpc64.

Approved by:	portmgr (tier-2 blanket)

Mark as broken on tier-2 archs: invokes x86 assembler.

Approved by:	portmgr (tier-2 blanket)

Update mpfr to 4.0.1 release and bump PORTVERSION of dependent ports.

math/flint2: Update g20170804 -> g20180323

Port changes:
* Change to the repo that is current
* Change to cmake
* Update/add patches required to build on FreeBSD

New port: math/flint2: Fast library for number theory