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/libwebp/libwebp.toml

@@ -7,6 +7,7 @@ configure = [
     "-DWEBP_BUILD_CWEBP=ON",
     "-DWEBP_BUILD_DWEBP=ON",
     "-DCMAKE_SKIP_INSTALL_RPATH=ON",
+    "-DBUILD_SHARED_LIBS=ON",
     "-DWEBP_BUILD_EXTRAS=OFF",
     "-DWEBP_BUILD_GIF2WEBP=ON",
     "-DWEBP_BUILD_IMG2WEBP=ON",
@@ -21,6 +22,7 @@ build = [
     "giflib",
     "libjpeg-turbo",
     "libpng",
+    "libtiff"
 ]
 runtime = ["glibc"]