graphics/opencv: update to 4.5.1 -- and make port more easily maintainable

This is a major upgrade from 3.x to 4.x.

Changelog from versions 3.4.1--4.5.1 can be found here:
    https://github.com/opencv/opencv/wiki/ChangeLog

Note: this has explicitely not been added as a new graphics/opencv4 port, but replaces the
      previous graphics/opencv[3] port. Again, to improve maintainability by not giving ports
      the option to pick the "wrong one" - this leads however to some abandoned ports being
      broken.

The port has been greatly simplified:
    * graphics/opencv-core which existed to enable ffmpeg to depend on opencv, and vice versa
      has been removed. ffmpeg no longer can depend on opencv.
    * graphics/py-opencv has been integrated into graphics/opencv, the default versions python
      bindings will be built unless the PYTHON option is explicitely turned off.
    * graphics/opencv-java has been integrated into graphics/opencv -- it is off by default,
      but can be enabled by toggling the JAVA option -- there are no consumers in the tree,
      so that option might go away in the future.
    * All the previous options have been removed and replaced by a (hopefully) sane set of
      dependencies that make the port and package most usable for the majority of consumers.
      - Please let me know if you think there are better defaults (i.e. anything that is missing,
        or something that should not be dependet on).
      - If you think something should be added or removed, please open a bug report.
      - If you think something should be added as an optional dependency, please open a
        bug report (with a good reason [tm]).

The depending ports have been updated to work against opencv4, or marked broken.
    * Ports broken:
      - graphics/rubygem-objectdetect: OpenCV4 no longer ships opencv-1.0 API
      - graphics/p5-Image-ObjectDetect: OpenCV4 no longer ships opencv-1.0 API
      - graphics/gimp-gmic-plugin: OpenCV4 no longer ships opencv-1.0 API
    * Backports:
      - misc/visp: https://github.com/lagadic/visp/commit/dfa7e4bd47c24cd2e631477e6afb18806733ff8a
      - multimedia/zart: https://github.com/c-koi/zart/commit/6ca1964690afbbc78627d7c868a692401043a584,
                         https://github.com/c-koi/zart/commit/d3a2931b1a07ec0322211f253468000363c4b6cb
    * Others:
      - misc/actiona: switch to pkgconfig 'opencv4'
      - multimedia/libav: drop opencv support
      - misc/darknet: already failed to build prior to the upgrade
      - math/saga: remove patching added to work against opencv3

3 files changed, 19 insertions, 3 deletions

diff --git a/multimedia/zart/Makefile b/multimedia/zart/Makefile
index f71bd30d5a34..8608afe2acce 100644
--- a/multimedia/zart/Makefile
+++ b/multimedia/zart/Makefile
@@ -2,10 +2,14 @@
 
 PORTNAME=	zart
 PORTVERSION=	g20191124
+PORTREVISION=	1
 CATEGORIES=	multimedia
 MASTER_SITES=	https://gmic.eu/files/source/:gmic
 DISTFILES=	gmic_${GMIC_VERSION}.tar.gz:gmic
 
+PATCH_SITES=	https://github.com/c-koi/zart/commit/
+PATCHFILES=	6ca1964690afbbc78627d7c868a692401043a584.patch:-p1
+
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	GMIC GUI for video streams
 
@@ -15,8 +19,7 @@ LICENSE_FILE=	${WRKSRC}/LICENSE
 LICENSE_PERMS=	dist-mirror dist-sell pkg-mirror pkg-sell auto-accept
 
 LIB_DEPENDS=	libgmic.so:graphics/gmic \
-		libopencv_core.so:graphics/opencv-core \
-		libopencv_video.so:graphics/opencv \
+		libopencv_core.so:graphics/opencv \
 		libfftw3.so:math/fftw3
 
 USES=		compiler:c++11-lang pkgconfig qmake qt:5
diff --git a/multimedia/zart/distinfo b/multimedia/zart/distinfo
index 8777cd82ca23..ca97bde3e4a9 100644
--- a/multimedia/zart/distinfo
+++ b/multimedia/zart/distinfo
@@ -1,5 +1,7 @@
-TIMESTAMP = 1577251091
+TIMESTAMP = 1612027931
 SHA256 (gmic_2.8.1.tar.gz) = 1a2b4c75c428201e52e920bd07e6c04118ae294cb89fce3c1c4ef386421b2a7a
 SIZE (gmic_2.8.1.tar.gz) = 5995556
 SHA256 (c-koi-zart-g20191124-099554f_GH0.tar.gz) = 667bb0730cc462f31659b33b66cbc521e94a321e4eea96d79ded2f6ee31b002e
 SIZE (c-koi-zart-g20191124-099554f_GH0.tar.gz) = 293482
+SHA256 (6ca1964690afbbc78627d7c868a692401043a584.patch) = 00c749fd75b460e57f6ad99c44c6c9f81c66d88468dd79cf2698cf7f6282bb6a
+SIZE (6ca1964690afbbc78627d7c868a692401043a584.patch) = 1154
diff --git a/multimedia/zart/files/patch-zart.pro b/multimedia/zart/files/patch-zart.pro
new file mode 100644
index 000000000000..db8f6d7fe19f
--- /dev/null
+++ b/multimedia/zart/files/patch-zart.pro
@@ -0,0 +1,11 @@
+--- zart.pro.orig	2021-01-30 17:27:07 UTC
++++ zart.pro
+@@ -29,7 +29,7 @@ greaterThan(QT_MAJOR_VERSION, 4): CONFIG += c++11
+ CONFIG	+= warn_on
+ QT_CONFIG -= no-pkg-config
+ CONFIG += link_pkgconfig
+-PKGCONFIG += opencv fftw3 zlib
++PKGCONFIG += opencv4 fftw3 zlib
+ DEFINES += cimg_use_fftw3 cimg_use_zlib
+ 
+ DEFINES += QT_DEPRECATED_WARNINGS