distinguish build_dir for product tasks

Author: kateinoigakukun

lib/ruby_wasm/build_system/product/libyaml.rb

@@ -26,11 +26,10 @@ def install_root
     end
 
     def name
-      "libyaml-#{target}"
+      product_build_dir
     end
 
     def define_task
-      desc "build libyaml #{LIBYAML_VERSION} for #{target}"
       @install_task =
         task(name) do
           next if Dir.exist?(install_root)

lib/ruby_wasm/build_system/product/zlib.rb

@@ -26,11 +26,10 @@ def install_root
     end
 
     def name
-      "zlib-#{target}"
+      product_build_dir
     end
 
     def define_task
-      desc "build zlib #{ZLIB_VERSION} for #{target}"
       @install_task =
         task(name) do
           next if Dir.exist?(install_root)