unmaintained/opencv: remove, there is one in testing

unmaintained/opencv/APKBUILD

-# Contributor: Carlo Landmeter <clandmeter@gmail.com>
-# Maintainer:
-pkgname=opencv
-pkgver=3.2.0
-pkgrel=6
-pkgdesc="Computer vision and machine learning software library"
-url="https://opencv.org"
-arch="all"
-license="BSD-3-Clause"
-makedepends="cmake ffmpeg-dev libpng-dev libjpeg-turbo-dev tiff-dev jasper-dev
-	libgomp openexr-dev gtk+3.0-dev gtk+-dev gst-plugins-base-dev
-	libgphoto2-dev v4l-utils-dev libwebp-dev libdc1394-dev doxygen"
-subpackages="$pkgname-dev $pkgname-libs"
-source="opencv-$pkgver.tar.gz::https://github.com/opencv/opencv/archive/$pkgver.tar.gz"
-
-prepare() {
-	default_prepare
-	# purge 3rd party except carotene
-	for i in "$builddir"/3rdparty/*; do
-		case $i in
-		*/carotene*) continue;;
-		esac
-		rm -rf "$i"
-	done
-}
-
-build() {
-	if [ "$CARCH" != "x86_64" ]; then
-		local _sse="-DENABLE_SSE=OFF -DENABLE_SSE2=OFF"
-	fi
-	cmake \
-		-DCMAKE_INSTALL_PREFIX=/usr \
-		-DCMAKE_INSTALL_LIBDIR=lib \
-		-DBUILD_SHARED_LIBS=True \
-		-DCMAKE_BUILD_TYPE=None \
-		-DCMAKE_CXX_FLAGS="$CXXFLAGS" \
-		-DCMAKE_C_FLAGS="$CFLAGS" \
-		-DENABLE_PRECOMPILED_HEADERS=OFF \
-		-DWITH_OPENMP=ON \
-		-WITH_OPENCL=ON \
-		-DWITH_IPP=OFF \
-		$_sse
-	make
-}
-
-package() {
-	make DESTDIR="$pkgdir" install
-}
-
-sha512sums="381fc8146722f7eeed5ec6f36a0180f3210a0bc8412f9f9d5d667827241a12709afee6fd42fb6f8b4e0ff4ed96cc645c55590ac89f65c529d4fbb6cd0ee752ed  opencv-3.2.0.tar.gz"