build: Fix local source build

Author: kateinoigakukun

lib/ruby_wasm/build/product/ruby_source.rb

@@ -19,7 +19,7 @@ def cache_key(digest)
       when "tarball"
         digest << @params[:url]
       when "local"
-        digest << File.mtime(@params[:src]).to_i.to_s
+        digest << File.mtime(@params[:path]).to_i.to_s
       else
         raise "unknown source type: #{@params[:type]}"
       end
@@ -75,7 +75,7 @@ def fetch(executor)
         )
       when "local"
         executor.mkdir_p File.dirname(src_dir)
-        executor.cp_r @params[:src], src_dir
+        executor.cp_r @params[:path], src_dir
       else
         raise "unknown source type: #{@params[:type]}"
       end

lib/ruby_wasm/cli.rb

@@ -187,7 +187,11 @@ def compute_build_source(options)
           if options[:patches]
             RubyWasm.logger.warn "Patches specified through --patch are ignored for local sources"
           end
-          return { type: "local", path: src_name }
+          # @type var local_source: RubyWasm::Packager::build_source_local
+          local_source = { type: "local", path: src_name }
+          # @type var local_source: RubyWasm::Packager::build_source
+          local_source = local_source.merge(name: "local", patches: [])
+          return local_source
         end
         # Otherwise, it's an unknown source.
         raise(