package/qt5charts: drop qt 5.6 support

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/qt5/qt5charts/qt5charts.hash

@@ -1,6 +1,3 @@
-# Hash from: https://download.qt.io/official_releases/qt/5.6/5.6.3/submodules/qtcharts-opensource-src-2.1.3.tar.xz.mirrorlist
-sha256 f636a9b1c255f678f11b36cd73abc807d16dae0c31ecbc75c09524703aae7d2f  qtcharts-opensource-src-2.1.3.tar.xz
-
 # Hash from: https://download.qt.io/official_releases/qt/5.12/5.12.7/submodules/qtcharts-everywhere-src-5.12.7.tar.xz.sha256
 sha256 434065526d0b1d8921e96cc1827b1a3579e073b930fe536455c4c1da2f15cf5f qtcharts-everywhere-src-5.12.7.tar.xz
 

package/qt5/qt5charts/qt5charts.mk

@@ -4,21 +4,14 @@
 #
 ################################################################################
 
-# Qt5Charts does not follow Qt versionning for 5.6
-ifeq ($(BR2_PACKAGE_QT5_VERSION_LATEST),y)
 QT5CHARTS_VERSION = $(QT5_VERSION)
-else
-QT5CHARTS_VERSION = 2.1.3
-endif
 QT5CHARTS_SITE = $(QT5_SITE)
 QT5CHARTS_SOURCE = qtcharts-$(QT5_SOURCE_TARBALL_PREFIX)-$(QT5CHARTS_VERSION).tar.xz
 QT5CHARTS_DEPENDENCIES = qt5base
 QT5CHARTS_INSTALL_STAGING = YES
 
 QT5CHARTS_LICENSE = GPL-3.0
-ifeq ($(BR2_PACKAGE_QT5_VERSION_LATEST),y)
 QT5CHARTS_LICENSE_FILES = LICENSE.GPL3
-endif
 
 ifeq ($(BR2_PACKAGE_QT5DECLARATIVE),y)
 QT5CHARTS_DEPENDENCIES += qt5declarative