icu_codepointtrie_builder: include cpp directory

Author: sffc

components/collections/codepointtrie_builder/Cargo.toml

@@ -15,7 +15,7 @@ include = [
     "Cargo.toml",
     "LICENSE",
     "README.md",
-    "ucptrie_wrap.wasm"
+    "cpp/**/*"
 ]
 
 authors.workspace = true