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/build.sh

@@ -0,0 +1,32 @@
+make MYCFLAGS="$CFLAGS -fPIC" MYLDFLAGS="$LDFLAGS" linux
+cd ../lua++-5.5.0
+make MYCFLAGS="$CXXFLAGS -fPIC" MYLDFLAGS="$LDFLAGS" LUA_A=liblua++.a LUA_SO=liblua++.so linux
+cd ../lua-5.5.0
+make \
+    TO_LIB="liblua.so liblua.so.5.5 liblua.so.5.5.0" \
+    INSTALL_DATA='cp -d' \
+    INSTALL_TOP="$DESTDIR"/usr \
+    INSTALL_MAN="$DESTDIR"/usr/share/man/man1 \
+    install
+  ln -sf /usr/bin/lua "$DESTDIR"/usr/bin/lua5.5
+  ln -sf /usr/bin/luac "$DESTDIR"/usr/bin/luac5.5
+  ln -sf /usr/lib/liblua.so.5.5.0 "$DESTDIR"/usr/lib/liblua5.5.so
+
+  install -Dm644 lua.pc "$DESTDIR"/usr/lib/pkgconfig/lua55.pc
+  ln -sf lua55.pc "$DESTDIR"/usr/lib/pkgconfig/lua.pc
+  ln -sf lua55.pc "$DESTDIR"/usr/lib/pkgconfig/lua5.5.pc
+  ln -sf lua55.pc "$DESTDIR"/usr/lib/pkgconfig/lua-5.5.pc
+
+cd ../lua++-5.5.0
+  make \
+    TO_LIB="liblua++.so liblua++.so.5.5 liblua++.so.5.5.0" \
+    INSTALL_BIN=null INSTALL_INC=null INSTALL_MAN=../null \
+    INSTALL_DATA='cp -d' \
+    INSTALL_TOP="$DESTDIR"/usr \
+    install
+  ln -sf /usr/lib/liblua++.so.5.5.0 "$DESTDIR"/usr/lib/liblua++5.5.so
+
+  install -Dm644 lua++.pc "$DESTDIR"/usr/lib/pkgconfig/lua++55.pc
+  ln -sf lua++55.pc "$DESTDIR"/usr/lib/pkgconfig/lua++.pc
+  ln -sf lua++55.pc "$DESTDIR"/usr/lib/pkgconfig/lua++5.5.pc
+  ln -sf lua++55.pc "$DESTDIR"/usr/lib/pkgconfig/lua++-5.5.pc