Ports/qt6: Add qt6-serenity

And this is the platform plugin we need to run Qt6 apps properly

Ports/qt6-serenity/package.sh

@@ -0,0 +1,43 @@
+#!/usr/bin/env -S bash ../.port_include.sh
+port=qt6-serenity
+version=git
+depends=("qt6-qtbase")
+workdir=QSerenityPlatform-master
+useconfigure=true
+files="https://github.com/SerenityPorts/QSerenityPlatform/archive/master.zip QSerenityPlatform-git.zip"
+configopts=(
+    "-GNinja"
+    "-DCMAKE_TOOLCHAIN_FILE=${SERENITY_BUILD_DIR}/CMakeToolchain.txt"
+    "-DCMAKE_CROSSCOMPILING=ON"
+    "-DQT_HOST_PATH=/usr"
+)
+
+QT_HOST_PATH=/usr
+QT_HOST_CMAKE_PATH=${QT_HOST_PATH}/lib64/cmake
+QT_HOST_TOOLS="HostInfo CoreTools GuiTools WidgetsTools"
+QT_HOST_TOOLS_PATH="${QT_HOST_CMAKE_PATH}/Qt6%s/\n"
+
+configure() {
+    for host_tool in ${QT_HOST_TOOLS}; do
+        if [[ ! -d $(printf $QT_HOST_TOOLS_PATH $host_tool) ]]; then
+            echo "You need to have Qt installed on the host (path "$(printf $QT_HOST_TOOLS_PATH $host_tool)" is missing"
+            exit 1
+        fi
+    done
+
+    MERGED_HOST_TOOLS=$(for host_tool in ${QT_HOST_TOOLS}; do echo "-DQt6${host_tool}_DIR=${QT_HOST_CMAKE_PATH}/Qt6${host_tool}/"; done)
+
+    run cmake ${configopts[@]} ${MERGED_HOST_TOOLS}
+}
+
+build() {
+    run ninja
+}
+
+install() {
+    run ninja install
+}
+
+clean() {
+    run ninja clean
+}