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/svt-av1/svt-av1.toml

@@ -0,0 +1,32 @@
+[build]
+type = "cmake"
+
+[build.flags]
+build_dir = "build"
+configure = [
+    "-DBUILD_SHARED_LIBS=ON",
+    "-G Ninja",
+    "-DNATIVE=OFF",
+]
+
+[dependencies]
+build = [
+    "cmake",
+    "nasm",
+    "ninja",
+]
+runtime = ["glibc"]
+
+[package]
+description = "Scalable Video Technology AV1 encoder and decoder"
+homepage = "https://gitlab.com/AOMediaCodec/SVT-AV1"
+license = [
+    "BSD-3-Clause-Clear",
+    "BSD-3-Clause",
+]
+name = "svt-av1"
+version = "4.0.1"
+
+[[source]]
+extract_dir = "$name-$version"
+url = "https://gitlab.com/AOMediaCodec/SVT-AV1.git#v$version"