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/gsfonts/build.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+set -eu
+
+patch -Np1 -i ../3c0ba3b5687632dfc66526544a4e811fe0ec0cd9.patch
+
+install -vDm 644 fonts/*.otf -t "$DESTDIR/usr/share/fonts/gsfonts/"
+install -vDm 644 appstream/*.xml -t "$DESTDIR/usr/share/metainfo/"
+
+install -vdm 755 "$DESTDIR/usr/share/fontconfig/conf.default/"
+for _config in fontconfig/*.conf; do
+    _config_path="$DESTDIR/usr/share/fontconfig/conf.avail/69-${_config##*/}"
+    install -vDm 644 "$_config" "$_config_path"
+    ln -srf "$_config_path" "$DESTDIR/usr/share/fontconfig/conf.default/"
+done

extra/gsfonts/gsfonts.toml

@@ -0,0 +1,17 @@
+[build]
+type = "custom"
+
+[[manual_sources]]
+url = "https://github.com/ArtifexSoftware/urw-base35-fonts/commit/3c0ba3b5687632dfc66526544a4e811fe0ec0cd9.patch"
+
+[package]
+description = "(URW)++ base 35 font set"
+homepage = "https://github.com/ArtifexSoftware/urw-base35-fonts"
+license = "AGPL-3.0-only WITH PS-or-PDF-font-exception-20170817"
+name = "gsfonts"
+version = "20200910"
+
+[[source]]
+extract_dir = "$name-$version"
+sha256 = "e0d9b7f11885fdfdc4987f06b2aa0565ad2a4af52b22e5ebf79e1a98abd0ae2f"
+url = "https://github.com/ArtifexSoftware/urw-base35-fonts/archive/$version/urw-base35-fonts-$version.tar.gz"