Changes by upstream:
https://github.com/collective/icalendar/compare/3.11.7...4.0.3

PR:		229901
Submitted by:	freebsd_ports@k-worx.org
Approved by:	maintainer timeout

FLAVOR is the current port's flavor, it should not be used outside of
this scope.

Sponsored by:	Absolight

  Ports using USE_PYTHON=distutils are now flavored.  They will
  automatically get flavors (py27, py34, py35, py36) depending on what
  versions they support.

  There is also a USE_PYTHON=flavors for ports that do not use distutils
  but need FLAVORS to be set.  A USE_PYTHON=noflavors can be set if
  using distutils but flavors are not wanted.

  A new USE_PYTHON=optsuffix that will add PYTHON_PKGNAMESUFFIX has been
  added to cope with Python ports that did not have the Python
  PKGNAMEPREFIX but are flavored.

  USES=python now also exports a PY_FLAVOR variable that contains the
  current python flavor.  It can be used in dependency lines when the
  port itself is not python flavored.  For example, deskutils/calibre.

  By default, all the flavors are generated.  To only generate flavors
  for the versions in PYTHON2_DEFAULT and PYTHON3_DEFAULT, define
  BUILD_DEFAULT_PYTHON_FLAVORS in your make.conf.

  In all the ports with Python dependencies, the *_DEPENDS entries MUST
  end with the flavor so that the framework knows which to build/use.
  This is done by appending '@${PY_FLAVOR}' after the origin (or
  @${FLAVOR} if in a Python module with Python flavors, as the content
  will be the same).  For example:

    RUN_DEPENDS= ${PYTHON_PKGNAMEPREFIX}six>0:devel/py-six@${PY_FLAVOR}

PR:		223071
Reviewed by:	portmgr, python
Sponsored by:	Absolight
Differential Revision:	https://reviews.freebsd.org/D12464

PR:		223340
Submitted by:	Sebastian Schwarz <seschwar@gmail.com>
Approved by:	maintainer (timeout)

- While I'm here:
  - Fix indent
  - Sort USE_PYTHON

PR:		219610
Submitted by:	Rudolf Siegel <rs.os@t-online.de>
Approved by:	maintainer (timeout, 15 days)

Changes:	https://github.com/collective/icalendar/blob/master/CHANGES.rst
PR:		215654
Submitted by:	Junji NAKANISHI <jun-g@daemonfreaks.com> (maintainer)