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.

core/libtool/libtool.toml

@@ -7,7 +7,6 @@ runtime = [
     "sh",
     "coreutils",
 ]
-test = ["findutils"]
 
 [package]
 description = "GNU generic library support script"
@@ -21,6 +20,3 @@ extract_dir = "$name-$version"
 sha256 = "f81f5860666b0bc7d84baddefa60d1cb9fa6fceb2398cc3baca6afaa60266675"
 url = "https://mirrors.kernel.org/gnu/libtool/libtool-$version.tar.xz"
 
-[build.flags]
-post_install = [ "rm -fv $DESTDIR/usr/lib/libltdl.a" ]
-skip_tests = true