Add various packages and patches for build system improvements

- Introduced valgrind with a patch to respect flags and updated its configuration.
- Added Vulkan ICD loader with CMake build configuration.
- Implemented Waf build system with a custom build script and configuration.
- Included Wayland protocols with Meson build system.
- Added xcb-util-keysyms with autotools configuration.
- Introduced Yasm with multiple patches for compatibility and improvements.
- Added Yelp tools and XSL with Meson build configurations and necessary patches for POSIX compliance.

extra/dbus/dbus.initd

@@ -0,0 +1,33 @@
+#!/sbin/openrc-run
+name="System Message Bus"
+description="D-Bus System Message Bus"
+
+extra_started_commands="reload"
+
+command="/usr/bin/dbus-daemon"
+command_args="--system --nofork --nopidfile --syslog-only ${command_args:-}"
+command_background="yes"
+pidfile="/run/$RC_SVCNAME.pid"
+
+depend() {
+	need localmount
+	after bootmisc
+}
+
+start_pre() {
+	checkpath -d -m755 -o "${command_user:-root:messagebus}" /run/dbus || return 1
+
+	/usr/bin/dbus-uuidgen --ensure="${machine_id:-/etc/machine-id}"
+}
+
+stop_post() {
+	[ ! -S /run/dbus/system_bus_socket ] || rm -f /run/dbus/system_bus_socket
+}
+
+reload() {
+	ebegin "Reloading $name configuration"
+	/usr/bin/dbus-send --print-reply --system --type=method_call \
+			--dest=org.freedesktop.DBus \
+			/ org.freedesktop.DBus.ReloadConfig > /dev/null
+	eend $?
+}