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/fontconfig.toml

@@ -0,0 +1,57 @@
+[build]
+type = "meson"
+
+[build.flags]
+build_dir = "build"
+configure = [
+    "--wrap-mode=nofallback",
+    "-Dbitmap-conf=noinstall",
+    "-Ddefault-sub-pixel-rendering=noinstall",
+    "-Ddoc-html=disabled",
+    "-Ddoc-pdf=disabled",
+    "-Ddoc-txt=disabled",
+]
+post_install = [
+    'mkdir -p "$DESTDIR/usr/share/fontconfig/conf.default"',
+    'for _f in "$DESTDIR"/etc/fonts/conf.d/*.conf; do [ -e "$_f" ] || continue; ln -sf "../conf.avail/${_f##*/}" "$DESTDIR/usr/share/fontconfig/conf.default/${_f##*/}"; rm -f "$_f"; done',
+    'install -Dm644 "$DEPOT_SPECDIR/40-fontconfig-config.toml" -t "$DESTDIR/usr/share/depot.d/hooks"',
+    'install -Dm644 "$DEPOT_SPECDIR/fontconfig-hook.toml" -t "$DESTDIR/usr/share/depot.d/hooks"',
+    'install -D "$DEPOT_SPECDIR/40-fontconfig-config.script" "$DESTDIR/usr/share/depot.d/scripts/fontconfig/40-fontconfig-config"',
+]
+keep = [ "etc/fonts/fonts.conf" ]
+
+[dependencies]
+build = [
+    "docbook-sgml",
+    "gperf",
+    "meson",
+    "perl-sgmls",
+]
+runtime = [
+    "sh",
+    "expat",
+    "freetype2",
+    "glibc",
+]
+
+[[manual_sources]]
+files = [
+    "40-fontconfig-config.script",
+    "40-fontconfig-config.toml",
+    "fontconfig-hook.toml",
+    "postinstall.sh",
+    "postupdate.sh",
+    "fontconfig-2.17.1-posixify.patch"
+]
+
+[package]
+description = "Library for configuring and customizing font access"
+homepage = "https://www.freedesktop.org/wiki/Software/fontconfig/"
+license = "HPND AND Unicode-DFS-2016"
+name = "fontconfig"
+version = "2.17.1"
+
+[[source]]
+extract_dir = "$name-$version"
+url = "https://gitlab.freedesktop.org/api/v4/projects/890/packages/generic/fontconfig/$version/fontconfig-$version.tar.xz"
+patches = [ "fontconfig-2.17.1-posixify.patch" ]