Add configuration files and patches for R, SDL2, SDL3, Tk, and Vala

- Introduced `r.toml` for R package configuration, including build flags and dependencies.
- Added `sdl2-compat.toml` for SDL2 compatibility layer with SDL3, specifying build and runtime dependencies.
- Created a patch for SDL3 to handle cases when XInput2 is not available, ensuring compatibility.
- Added `sdl3.toml` for SDL3 configuration, including build flags and dependencies.
- Introduced `tk.toml` for Tk configuration, detailing build flags and runtime dependencies.
- Added a patch for Vala to ensure POSIX compliance in the test runner script, improving portability.

extra/lua/lua.toml

@@ -0,0 +1,36 @@
+[alternatives]
+provides = ["lua55"]
+
+[build]
+type = "custom"
+
+[dependencies]
+runtime = ["readline"]
+
+[[manual_sources]]
+files = [
+    "paths.patch",
+    "lua.pc",
+    "lua-5.5.0-posixify.patch"
+]
+
+[package]
+description = "Powerful lightweight programming language designed for extending applications"
+homepage = "https://www.lua.org/"
+license = "MIT"
+name = "lua"
+version = "5.5.0"
+
+[[source]]
+extract_dir = "$name-$version"
+patches = [
+    "paths.patch",
+    "lua-5.5.0-posixify.patch"
+]
+post_extract = [
+    "cp -r ../lua-$version ../lua++-$version",
+    'sed "s/%VER%/5.5/g;s/%REL%/$version/g" ../lua.pc > lua.pc',
+    'sed "s/%VER%/5.5/g;s/%REL%/$version/g;s/-llua/-llua++/g" lua.pc > ../lua++-$version/lua++.pc',
+]
+sha256 = "57ccc32bbbd005cab75bcc52444052535af691789dba2b9016d5c50640d68b3d"
+url = "https://www.lua.org/ftp/lua-$version.tar.gz"