unity8: initial packaging (!27)

* Mir starts up and is able to display system settings
* x86_64 only for now, because at least ubuntu-app-test did not build
  on aarch64

Based on PureTryOut's work. Getting it to this stage was a huge effort
(as it shows in the package count: 111(!)). See the merge request for
details.

[skip ci]: this won't finish in CI; ollieparanoid made sure that
           everything builds for x86_64.

main/dbus-cpp/APKBUILD

@@ -0,0 +1,44 @@
+# Maintainer: Luca Weiss <luca@z3ntu.xyz>
+pkgname=dbus-cpp
+pkgver=5.0.1
+pkgrel=0
+_commit="967dc1caf0efe0a1286c308e8e8dd1bf7da5f3ee"
+pkgdesc="A header-only dbus-binding leveraging C++-11"
+url="https://code.launchpad.net/dbus-cpp"
+arch="x86_64"
+license="LGPL3"
+depends="dbus libxml2 boost properties-cpp"
+depends_dev="boost-dev"
+makedepends="$depends_dev cmake cmake-extras libxml2-dev properties-cpp-dev dbus-dev linux-headers process-cpp-dev gtest-dev gmock"
+install=""
+subpackages="$pkgname-dev"
+source="https://github.com/lib-cpp/dbus-cpp/archive/$_commit.tar.gz
+	boost_io_context.patch" # https://github.com/lib-cpp/dbus-cpp/pull/2
+builddir="$srcdir/$pkgname-$_commit"
+options="!check" # 53% tests passed, 7 tests failed out of 15
+
+build() {
+	mkdir "$builddir"/build
+	cd "$builddir"/build
+	cmake .. \
+		-DCMAKE_INSTALL_LIBDIR=/usr/lib \
+		-DCMAKE_INSTALL_PREFIX=/usr \
+		-DCMAKE_BUILD_TYPE=Release \
+		-DDBUS_CPP_VERSION_MAJOR=5 \
+		-DDBUS_CPP_VERSION_MINOR=0 \
+		-DDBUS_CPP_VERSION_PATCH=0
+	make
+}
+
+check() {
+	cd "$builddir"/build
+	make test
+}
+
+package() {
+	cd "$builddir"/build
+	make DESTDIR="$pkgdir" install
+}
+
+sha512sums="6db299307eb966600d488aa31db2814095c562c9c62a46b614ec1fa361f3c17900bbbe3da021629e6b7279ad99bf193393772302bfc8f6b5ea80ef3497fb7f46  967dc1caf0efe0a1286c308e8e8dd1bf7da5f3ee.tar.gz
+55862c347f2aeabd00b3d547b34c7b3c5bbbb3f40a76cb2e20711c6168b4780db36436f631cf33f1b6ff48f3e6a83480db1df69cafa7e8a25e5f06df9ea53829  boost_io_context.patch"

main/dbus-cpp/boost_io_context.patch

@@ -0,0 +1,25 @@
+diff --git a/include/core/dbus/asio/executor.h b/include/core/dbus/asio/executor.h
+index d1f043e..505a55b 100644
+--- a/include/core/dbus/asio/executor.h
++++ b/include/core/dbus/asio/executor.h
+@@ -18,18 +18,12 @@
+ #ifndef CORE_DBUS_ASIO_EXECUTOR_H_
+ #define CORE_DBUS_ASIO_EXECUTOR_H_
+ 
++#include <boost/asio/io_service.hpp>
++
+ #include <core/dbus/bus.h>
+ #include <core/dbus/executor.h>
+ #include <core/dbus/visibility.h>
+ 
+-namespace boost
+-{
+-namespace asio
+-{
+-class io_service;
+-}
+-}
+-
+ namespace core
+ {
+ namespace dbus