build: Split command arguments at Ruby level take 2

Author: kateinoigakukun

lib/ruby_wasm/build/product/crossruby.rb

@@ -53,20 +53,20 @@ def do_extconf(executor, crossruby)
         "--disable=gems",
         # HACK: top_srcdir is required to find ruby headers
         "-e",
-        %Q('$top_srcdir="#{source.src_dir}"'),
+        %Q($top_srcdir="#{source.src_dir}"),
         # HACK: extout is required to find config.h
         "-e",
-        %Q('$extout="#{crossruby.build_dir}/.ext"'),
+        %Q($extout="#{crossruby.build_dir}/.ext"),
         # HACK: force static ext build by imitating extmk
         "-e",
-        "'$static = true; trace_var(:$static) {|v| $static = true }'",
+        "$static = true; trace_var(:$static) {|v| $static = true }",
         # HACK: $0 should be extconf.rb path due to mkmf source file detection
         # and we want to insert some hacks before it. But -e and $0 cannot be
         # used together, so we rewrite $0 in -e.
         "-e",
-        %Q('$0="#{@srcdir}/extconf.rb"'),
+        %Q($0="#{@srcdir}/extconf.rb"),
         "-e",
-        %Q('require_relative "#{@srcdir}/extconf.rb"'),
+        %Q(require_relative "#{@srcdir}/extconf.rb"),
         "-I#{crossruby.build_dir}"
       ]
       # Clear RUBYOPT to avoid loading unrelated bundle setup

lib/ruby_wasm/build/product/wasi_vfs.rb

@@ -48,8 +48,8 @@ def build(executor)
       lib_wasi_vfs_url =
         "https://github.com/kateinoigakukun/wasi-vfs/releases/download/v#{WASI_VFS_VERSION}/libwasi_vfs-wasm32-unknown-unknown.zip"
       Dir.mktmpdir do |tmpdir|
-        executor.system "curl -L #{lib_wasi_vfs_url} -o #{tmpdir}/libwasi_vfs.zip"
-        executor.system "unzip #{tmpdir}/libwasi_vfs.zip -d #{tmpdir}"
+        executor.system "curl", "-L", lib_wasi_vfs_url, "-o", "#{tmpdir}/libwasi_vfs.zip"
+        executor.system "unzip", "#{tmpdir}/libwasi_vfs.zip", "-d", tmpdir
         executor.mkdir_p File.dirname(lib_wasi_vfs_a)
         executor.mv File.join(tmpdir, "libwasi_vfs.a"), lib_wasi_vfs_a
       end
@@ -59,8 +59,8 @@ def install_cli
       return if !@need_fetch_cli || File.exist?(cli_bin_path)
       FileUtils.mkdir_p cli_product_build_dir
       zipfile = File.join(cli_product_build_dir, "wasi-vfs-cli.zip")
-      system "curl -L -o #{zipfile} #{self.cli_download_url}"
-      system "unzip #{zipfile} -d #{cli_product_build_dir}"
+      system "curl", "-L", "-o", zipfile, self.cli_download_url
+      system "unzip", zipfile, "-d", cli_product_build_dir
     end
 
     def cli_download_url