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/fontconfig/40-fontconfig-config.script

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+while IFS= read -r f; do
+  link=${1:?}/${f##*/}
+  if [ -e "$f" ] && [ ! -e "$link" ]; then
+    ln -s "/$f" "$link"
+  elif [ ! -e "$f" ] && [ -L "$link" ]; then
+    rm -f "$link"
+  fi
+done