rust-native: depend on llvm-native.dev for the LLVM headers

rustc_llvm compiles llvm-wrapper/*.cpp, which include
"llvm/Config/llvm-config.h". Those headers ship in the .dev package, and
rust-native listed only llvm-native and llvm-native.runtime, so the build
failed with

  LLVMWrapper.h:6:10: fatal error: llvm/Config/llvm-config.h:
  No such file or directory

even though the header was staged at
llvm-native/target/<triple>/stage.dev/usr/include/. recipes/dev/rust
declares the equivalent llvm21.dev for the same reason.

Latent because rust-native was commented out of the config and had never
been built.

local/recipes/dev/rust-native/recipe.toml

@@ -9,6 +9,13 @@ dependencies = [
     "openssl3",
     "llvm-native",
     "llvm-native.runtime",
+    # rustc_llvm compiles llvm-wrapper/*.cpp, which #include
+    # "llvm/Config/llvm-config.h". Those headers are staged by the .dev
+    # package, so without it the build fails with
+    #   LLVMWrapper.h:6:10: fatal error: llvm/Config/llvm-config.h:
+    #   No such file or directory
+    # recipes/dev/rust declares the equivalent llvm21.dev for the same reason.
+    "llvm-native.dev",
 ]
 script = """
 DYNAMIC_INIT