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-user.initd

@@ -0,0 +1,9 @@
+#!/sbin/openrc-run
+
+name="Login Message Bus"
+description="D-Bus Login Session Message Bus"
+
+supervisor=supervise-daemon
+command="/usr/bin/dbus-daemon"
+command_args="--session --nofork --nopidfile --address=$DBUS_SESSION_BUS_ADDRESS --print-address=3"
+notify=fd:3